Item 1. Business
ITEM 1. BUSINESS
Company Overview
We are a biopharmaceutical company focused on the development and commercialization of innovative cardiovascular medicines. Our approved product CARDAMYST TM (etripamil) nasal spray is available in the United States and is the first and only FDA approved self-administered treatment for use by patients anywhere, anytime an attack of PSVT occurs. We continue to seek, either directly or through collaboration with our partners, marketing approval from regulatory agencies responsible for regions outside the United States. We are also developing etripamil for the indication of atrial fibrillation with rapid ventricular rate, or “AFib-RVR.”
We are currently focusing our efforts and financial resources on (i) the commercialization of CARDAMYST TM (etripamil) nasal spray for the treatment of PSVT, (ii) the development of etripamil for the treatment of AFib-RVR and (iii) corporate development activities that have the potential to increase company value through strategic collaborations.
CARDAMYST TM (etripamil) nasal spray for the Treatment of PSVT
On December 12, 2025, we announced that the FDA approved our first commercial product, CARDAMYST (etripamil) nasal spray, a prescription medication for the conversion of acute symptomatic episodes of PSVT, to sinus rhythm in adults. We are focused on the commercialization of CARDAMYST, which became available in retail pharmacies in the first quarter of 2026. We manufacture CARDAMYST with a global supply chain that produces the active pharmaceutical ingredient, etripamil, and then formulates and assembles it into the delivery device, a nasal spray, before completing packaging of the saleable product which is then distributed via a third party logistics provider to wholesalers for delivery to retail pharmacies once prescriptions are received. To create demand, our sales team of approximately 60 representatives expects to engage healthcare providers who we believe will treat around 500,000 patients with a diagnosis of PSVT in 2026.
We designed the molecule of etripamil, and we are commercializing and further developing the drug, a novel, potent, and rapid-onset calcium channel blocker, as a nasal spray to be administered by the patient to terminate episodes of transient cardiovascular conditions as they occur. Rapid pharmacological action is both appropriate and sufficient to resolve an episode of supraventricular tachycardia, or “SVT.” We are also developing etripamil to provide acute ventricular rate control for patients with symptomatic episodes of atrial fibrillation with rapid ventricular rate and are exploring other therapeutic applications in which a patient-administered, rapid-onset, non-dihydropyridine calcium channel blocking agent could provide patient benefit.
In our work to develop potential therapies, we sought to create new chemical entities as analogs of known molecular classes with clinically validated mechanisms of action. Our goal was to preserve the beneficial pharmacology of existing molecules while altering their pharmacokinetic profile with focused medicinal chemistry to produce drugs that are fast acting. As a result, we created a series of novel non-dihydropyridine, L-type calcium channel blockers containing chemical ester moieties that preserved the desired pharmacology on the heart but that could be rapidly metabolized in the blood by serum esterases. Etripamil resulted from this effort as a new chemical entity with a fast pharmacodynamic effect in humans, relative to oral calcium channel blockers.
We believe that the following attributes of etripamil make it a better treatment candidate for certain episodic cardiovascular conditions than current standards of care:
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Action: Etripamil is designed to be rapidly metabolized by blood-borne esterases, with the goal of reducing either the duration of side effects that may occur with acute treatment or the long-term side effects that may occur with chronic drug therapy.
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• Absorption: Etripamil is designed to be absorbed into the bloodstream in less than 10 minutes through the inner lining of the nose, yielding a rapid-onset pharmacologic pattern consistent with parenterally administered drugs.
• Administration: Etripamil is designed, and has been investigated, to empower patients to self-administer treatment outside of a medical setting and as prompted by a patient’s symptoms.
PSVT
PSVT is a serious, markedly symptomatic, and recurring cardiac arrhythmia, caused by altered electrical conduction within the heart involving the atrioventricular, or “AV,” node and over an abnormal electrical circuit in most cases. The common form of PSVT, AV nodal reentrant tachycardia, or “AVNRT,” has an abnormal limb of electrical circuitry within the AV node that is the substrate of the tachycardia and forms the basis for a reentrant arrhythmia, resulting in excessively rapid beating of both the atria and ventricles.
In the next most common form of PSVT, atrioventricular reciprocating tachycardia, or “AVRT,” there is an abnormal limb of electrical tissue, or bypass tract, that directly connects the atria and the ventricles. In AVRT, the bypass tract allows the signal to travel between the atria and ventricles as a “short circuit.” AVRT also involves the AV node, in addition to the bypass tract. Thus, for both AVNRT and AVRT – two PSVT types that require the AV node as a part of their abnormal circuit (i.e., AV-nodal dependent PSVTs) – a drug which targets the AV node can represent a potential treatment. Non-dihydropyridine calcium channel blockers are a class of drugs that target the AV node, reflecting why etripamil has been an excellent therapeutic candidate for AVNRT and AVRT disruption and termination.
Current Treatment Options for PSVT
Treatment for PSVT depends on the frequency, duration, and severity of the episodes, as well as patient preference for pharmacologic or invasive treatment. Current options for patients with PSVT to acutely terminate an episode of arrhythmia include intravenous, or “IV,” medication (e.g., IV adenosine, IV calcium channel blockers), administered in an emergency department, which transiently alter electrical conduction over the AV node leading to termination of AV-dependent arrhythmias and restoration of sinus rhythm; or an external shock delivered in the emergency department. Of note, IV adenosine temporarily causes complete heart block and patients have reported experiencing chest tightness, flushing, and a sense of impending doom. Two other modalities, though of low effectiveness, are vagal maneuvers or oral medications administered at the onset of an episode (e.g., calcium channel blockers, beta blockers). Long-term, preventative strategies include chronic drug therapy to reduce the frequency of episodes, though patients exhibit break-through episodes of PSVT and emergency department visits for the same, despite chronic medications and cardiac ablation to potentially cure the disease. Patients may also elect not to treat their PSVT and simply endure episodes of SVT when they occur.
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Of note, chronic medication can lead to side effects such as sexual dysfunction or fatigue in the case of beta blockers and constipation in the case of verapamil. Some patients discontinue chronic oral medication due to intolerable side effects. Based on our market research, we estimate that approximately two thirds of patients with PSVT have been prescribed chronic medications such as beta blockers or calcium channel blockers to prevent episodes of SVT or to treat other concomitant conditions such as hypertension.
Ablations, a potentially curative treatment for PSVT, is an invasive procedure, which works by directly cauterizing or freezing the short circuit that is the substrate for the abnormal rhythm. This is achieved in an electrophysiology lab via catheters that enter the patient’s heart through the blood vessels and that deliver burning or freezing to ablate the abnormal electrical tissue. Ablation single-procedure success rates for PSVT are reported to be 91% to 96%. However, we estimate that less than 10% of eligible patients with PSVT per year choose this option, which we believe is due primarily to anxiety related to the procedure. Although ablations are generally considered to be safe by the treating community, as with any invasive procedure there are potential complications, which include bleeding, blood clots, pericardial tamponade, and transient or permanent heart block, with the latter requiring permanent pacemaker implantation.
PSVT Market Overview
PSVT is a condition that causes a patient’s heart to suddenly start beating faster than normal. It can be life-altering as PSVT is highly symptomatic, characterized by unpredictable attacks of a racing heart, often exceeding 150 beats per minute. Symptoms of PSVT arise suddenly and may include palpitations, sweating, chest pressure or pain, shortness of breath, sudden onset of fatigue, lightheadedness or dizziness, fainting, and anxiety, causing many patients to interrupt their daily activities at the time of symptom-onset. The impact and morbidity from an episode of PSVT can be especially detrimental in patients with underlying cardiovascular or medical conditions, such as heart failure, obstructive coronary disease, or dehydration. The uncertainty of when such an attack of PSVT will strike or how long it will persist is often anxiety-provoking, reducing patients’ quality of life and preventing participation in many desired activities. Drugs approved for the treatment of attacks of PSVT include adenosine, verapamil, and diltiazem, with all being administered intravenously under medical supervision, usually in the emergency department. Other oral drugs are sometimes used to treat attacks in a concept called “pill in the pocket.” However, those drugs have never been proven effective or safe and are not approved for this use. Doctors are often frustrated by the limited effective treatment options with the only approved options involving prolonged, unpleasant, and costly trips to the emergency department or, for some patients, an invasive ablation procedure. PSVT can be traumatic for patients, frustrating for healthcare providers, and costly for payors. With no pharmaceutical innovation in the treatment of PSVT for more than 30 years and a movement in the healthcare system to enable patient-centered care, we believe there is an opportunity to help patients living with PSVT to take greater control over their PSVT.
We believe that PSVT is a large and under-recognized market which we estimate affects more than two million Americans. From this diagnosed population, we define the immediate target addressable market for CARDAMYST as approximately 50% of patients with PSVT who have sufficient disease burden that they are compelled to seek care for their condition and are primarily managed by approximately 40,000 healthcare providers composed primarily of clinical cardiologists, interventional cardiologists and electrophysiologists. The remaining patients with PSVT can become addressable over time, as they are inconsistently managed (cycling in and out of the healthcare system). Furthermore, PSVT is expected to increase in diagnosed prevalence in coming years as wearable electrocardiogram, or “ECG,” technology (e.g., smartphone, watches) becomes both more adept at diagnosing PSVT and more widely used by patients and clinical practitioners, in turn shortening the time to diagnosis.
Following the release of data from the RAPID clinical study, in market research, cardiologists reported a willingness to prescribe CARDAMYST to approximately 50% of the patients with PSVT in their care, which suggests approximately 500,000 to 800,000 patients can potentially be treated with CARDAMYST in peak years. Additionally, we believe that this cardiology-identified group of patients may use CARDAMYST to treat a median of three to five episodes per year, based on the projected number of self-reported longer and more intense episodes experienced by patients, as well as the patient utilization experience in our Phase 3 clinical trials. This implies a peak demand potential in the United States for CARDAMYST of 2.5 million to 4 million episodes treated per year.
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Current treatment for PSVT also consumes significant healthcare resources. Research published in the American Journal of Cardiology in 2020 shows that total healthcare expenditures in the year following a diagnosis of PSVT ranged from $20,000 to $30,000 per patient which were significantly higher than the expenditures observed for patients without PSVT. These significant increases included increased emergency department visits and hospitalization costs. Of note, catheter ablations following diagnosis represented only 23% of this increased spend, meaning most costs were unrelated to ablations. Recent data from the Healthcare Cost and Utilization Project, or “HCUP,” database indicate that in 2019 there were approximately 140,000 emergency department, or “ED,” visits for PSVT when coded (for billing) in the primary diagnostic position, and a total of approximately 525,000 ED visits when PSVT was coded in any diagnostic position. Of these, approximately 25% of ED admissions for PSVT resulted in a hospital admission. HCUP estimates a total of approximately 40,000 to approximately 120,000 inpatient admissions for PSVT in 2019 (based again if a PSVT billing code was found in the primary v. any diagnostic position). Despite the effectiveness of catheter ablation, claims data suggests that only approximately 15% of patients with PSVT are ablated over a three-year period, leading to a total of approximately 100,000 catheter ablations annually. In total, up to $15.0 billion is spent annually in the United States on the management of PSVT.
PSVT Continued Development Highlights
In November 2025, we submitted our marketing authorization application, or “MAA,” to the European Medicines Agency, or “EMA,” for review for approval to market etripamil nasal spray, under the trade name TACHYMIST TM , in European Union. The MAA utilizes much of the clinical, manufacturing and quality data package that was submitted in the NDA which lead to the US FDA approval.
In January 2025, our licensing partner, Corxel (formerly Ji Xing Pharmaceuticals Limited, JIXING), announced that the Center for Drug Evaluation, or “CDE,” of the National Medical Products Administration, or “NMPA,” of the People’s Republic of China has accepted the New Drug Application, or “NDA,” for etripamil nasal spray for the treatment of PSVT. The NDA to the NMPA included data from the successful Phase 3 JX02002 clinical trial of etripamil nasal spray in patients with PSVT in China in addition to data included in the NDA that Milestone submitted to the FDA.
The 500-patient Phase 3 trial (JX02002) met its primary endpoint, with a Kaplan Meier analysis shows a statistically significantly greater proportion of patients who self-administered etripamil converted from PSVT to sinus rhythm within 30 minutes compared to placebo (40.5% vs. 15.9%, respectively; hazard ratio [HR] = 3.00; 95% CI 1.58-5.71; p<0.001). Statistically significant (p<0.05) results were also shown for the secondary efficacy endpoints for percent of patients’ PSVT converted to sinus rhythm by 10, 15, 45 and 60 minutes after self-administration of study drug.
Corxel further reported that, overall, treatment emergent adverse events were comparable between treatment groups, and there were no reported serious adverse events related to etripamil. The safety and tolerability data from the JX02002 trial were consistent with previous clinical studies. This important study further expands the etripamil global development program to more than 2,000 unique patients treated with etripamil.
Etripamil Nasal Spray for the Treatment of AFib-RVR
Similar to our approach for PSVT, we believe that etripamil has the potential to help people experiencing a symptomatic episode of AFib-RVR to self-treat and to conveniently, reliably, and quickly reduce their elevated heart rate, with the goal of reducing the need for emergency department utilization. We completed a successful Phase 2 study, named “ReVeRA” or the “ReVeRA study”, in patients presenting urgently with episodes of AFib-RVR to the emergency department. We have published the ReVeRA study and results, which demonstrated that patients receiving etripamil nasal spray experienced rapid and statistically superior ventricular rate reduction and improved symptom-relief compared to placebo, with safety and tolerability findings generally consistent with those observed in our PSVT program. We believe these data support the continued development of etripamil, self-administered in the medically unmonitored setting, for the treatment of AFib-RVR.
Incorporating FDA’s guidance, we have developed a Phase 3 registrational program to evaluate self-administered etripamil as a potential treatment for patients with AFib-RVR. We intend to pursue a supplemental new drug application, or “sNDA,”
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regulatory approval pathway for a potential second indication for etripamil in Afib-RVR. As such, we will leverage the PSVT indication and PSVT program data, along with a single pivotal Phase 3 study in patients with AFib-RVR.
Atrial Fibrillation
AFib is a common arrhythmia with an irregular and often rapid heart rate that can increase the risk of stroke, embolism, heart failure, and other cardiac morbidities. AFib is often highly symptomatic, particularly when episodes have rapid heart rates. Symptoms include heart palpitations, shortness of breath, fatigue, and weakness, and underlying cardiac disorders can be worsened. Episodes of atrial fibrillation can come and go, or patients may have AFib that does not resolve. Although the heart arrhythmia in AFib itself usually is not life-threatening, it is a serious medical condition that sometimes requires emergency treatment. Because AFib is associated with elevated risk of embolism and stroke, anticoagulant medications, also called blood thinners, are commonly prescribed to manage this risk. Uncertainty around symptom timing and episode length may impact a patient’s quality of life. During AFib, the heart’s two upper chambers, the atria, beat chaotically and irregularly—out of coordination with the two lower chambers, the ventricles, of the heart, as shown in the figure below.
Categorization of AFib is customarily defined as: paroxysmal, which involves episodes of AFib that resolve spontaneously within seven days of symptom onset; persistent, which involves episodes that fail to terminate within seven days of symptom onset and require treatment to convert back to sinus rhythm; long-standing persistent, which involves episodes of atrial fibrillation that last longer than one year despite continued attempts to restore sinus rhythm; and permanent, which involves a joint decision by the treating provider and patient to no longer pursue cardioversion and leave the patient in AFib, focusing on rate control and symptom management. Prevalence of categories includes approximately 40% of patients with AFib as paroxysmal stage, 30% as persistent and long-standing persistent stage, and 30% as permanent. Concomitant structural heart irregularities including valvular dysfunction and the presence of active symptoms may also help to characterize patients and influence treatment decisions.
Current Treatment Options for Atrial Fibrillation with Rapid Ventricular Rate
A common complication of AFib is an RVR which can be defined as a heart rate of ≥110 beats per minute. Irregular and inefficient cardiac pumping function caused by a RVR accounts for hemodynamic instability and many of the arrhythmia’s symptoms.
There are currently two major approaches to managing AFib: rate control to lower a RVR or upward excursions in rate, and rhythm control to both restore and maintain normal sinus rhythm and to prevent recurrent AFib. Either of these treatment approaches, often performed by pharmacological means, may be given chronically or acutely, depending on patient preference and episode frequency and severity, though each has limitations. The decision to pursue rate or rhythm control for episodes of AFib is dependent on factors including episode severity, episode frequency, patient preference, and safety and tolerability of treatments. Several rhythm control strategies exist, including electrical cardioversion, catheter-based cardiac ablation, and antiarrhythmic drug therapy. For rate control, the rapid heart rate of AFib is can be treated with chronically administered AV nodal acting drugs (e.g., calcium channel blockers, beta blockers, digoxin) to control RVR and symptoms from RVR, and to improve cardiac function/hemodynamic stability. Oral rate control drugs used acutely do not provide immediate ventricular rate control due to a 30-to-120-minute delayed onset of action. Breakthrough
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episodes of symptomatic atrial fibrillation often require urgent medical treatment with IV calcium channel blockers and IV beta blockers under medical supervision in an emergency department to quickly reduce heart rate before transitioning a patient back to oral therapy.
Of note, AHA and ACC guidelines do not explicitly acknowledge the as needed (PRN) approach to acutely administering oral rate control agents, however, market research conducted by us indicates a significant share of patients are managed this way. This market research, from 2018, estimated that approximately 40% of patients use acutely administered rate control medication to manage symptoms of atrial fibrillation. Additionally, our physician market research, from 2021, suggests that both clinical/interventional cardiologists and electrophysiologists prescribe PRN rate control for some of their patients with AFib.
Clinical Development Plan for Atrial Fibrillation with Rapid Ventricular Rate
In November 2023, we presented positive Phase 2 data from the ReVeRA study as a Featured Science Presentation at the American Heart Association Scientific Meetings (Philadelphia, PA) and as simultaneously published in Circulation: Arrhythmia and Electrophysiology . The Phase 2, double-blind, placebo-controlled, study, Reduction of Ventricular Rate in Patients with Atrial Fibrillation, or “ReVeRA”, was conducted in patients presenting urgently (e.g., to an emergency department) with AFib-RVR. ReVeRA’s objectives included evaluation of the potential effectiveness of etripamil NS to reduce RVR and to improve symptoms in patients with AFib and evaluation of the drug’s safety. The trial enrolled 87 patients and dosed 56 patients with blinded study drug (the latter having a ventricular rate of ≥110 beats per minute, or “bpm”) prior to receiving study drug.
Data showed that delivery of etripamil nasal spray significantly and rapidly reduced ventricular rate, with a time course consistent with the drug’s pharmacologic profile.
Etripamil achieved the primary endpoint with high statistical significance with patients experiencing a ventricular rate reduction of 29.91 bpm (95% confidence interval: -40.31, -19.52; p<0.0001) in the etripamil arm compared to placebo. The maximum absolute reduction in rate in the etripamil arm was 34.97 bpm. The median time to maximum reduction in ventricular rate, or “VR,” was 13 minutes in patients taking etripamil, and the duration of effect (reduction in VR from
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baseline and from placebo) was at least 150 min. The median duration of maintaining a VR <100 bpm was 45.5 min in the first 60 min following drug in the etripamil arm.
ReVeRA Primary Endpoint – Maximum Reduction in Ventricular Rate from Baseline
Primary Endpoint: Maximum Reduction in VR from Baseline
Placebo NS,
N=25 1
Etripamil NS, 70 mg,
N=24 1
Mean (95% CI), bpm
-5.06 (-7.44, -2.67)
-34.97 (-45.13, -24.87)
Difference in means (95% CI), bpm
─
-29.91 (-40.31, -19.52)
p-value 2
─
<0.0001
1 Efficacy population (all randomized patients receiving study drug remaining in atrial fibrillation with adequately diagnostic ECG recordings for at least 60 min post drug)
2 From ANCOVA; calculations adjust for variance in baseline
Bpm = beats per minute, ECG = electrocardiogram, CI = confidence interval, NS = nasal spray, VR = ventricular rate
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Etripamil treatment was associated with significant improvement in symptom relief and in treatment satisfaction as measured by the TSQM-9 patient reported outcome, or “PRO,” instrument. Patients treated with etripamil, compared to those treated with placebo, demonstrated significant improvements in satisfaction ratings in the TSQM-9 Effectiveness Domain (p<0.0001) and on the Relief of Symptoms Question from the Effectiveness Domain (p = 0.0002, with a treatment effect of 1.55 units). Moreover, patients in the placebo arm were given additional AFib-RVR treatments during the window of 60 minutes to 24 hours after study drug to an approximately two-fold greater degree than patients in the etripamil arm.
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In ReVeRA, safety and tolerability data were generally consistent with that observed in our PSVT program. Treatment-emergent serious adverse events, or “TESAEs,” were rare, with two occurring in one patient in the etripamil arm (3.7%) and four occurring in two patients in the placebo arm (6.9%). The TESAEs in the etripamil arm (transient severe bradycardia and syncope, assessed as due to hyper-vagotonia) occurred in a patient with a history of vagal events, and fully resolved by placing the patient supine and was without sequelae. The majority of common AEs were localized to the drug-administration site, and there was a low incidence of serious adverse events. The most common (≥ 5%) adverse events were mild or moderate in intensity and included nasal discomfort, rhinorrhea, increased lacrimation, throat irritation and dizziness.
These positive Phase 2 data have supported interactions with the FDA (as summarized in “AFib-RVR Clinical Development Highlights”) that have established a path to potential approval for an indication for etripamil in patients with AFib-RVR. The Phase 3 study is expected to use an optional repeat-dose, self-administration approach of etripamil nasal spray, outside of the medically supervised setting, that is similar to that used in the PSVT development program.
AFib-RVR Clinical Development Highlights
During 2024, we met with the FDA on the ReVeRA study, during which the FDA confirmed its guidance from our Pre-IND meeting (2023) regarding the availability of a sNDA pathway for the marketing approval for etripamil for the indication of AFib-RVR. The sNDA pathway potentially permits a single pivotal efficacy study to be sufficient for filing for marketing approval if etripamil is already approved for PSVT. FDA further concurred with respect to key proposed study elements including powering, inclusion criteria, patient population, and statistical analyses, and offered clarification with respect to the endpoints to guide the design of the Phase 3 study. In our mid-2023 Pre-IND meeting, the FDA provided guidance that our primary endpoint can be the reduction of ventricular rate, and the primary analysis would be performed on the intent to treat, or “ITT,” population. In addition, the study would have to show statistical significance (p<0.05) on the key secondary endpoint of symptom relief as a patient benefit, also in the ITT population. The secondary endpoint could use a PRO measure, and various PROs were discussed with the FDA. We have finalized the Phase 3 study protocol following FDA’s review and obtained concurrence with the FDA to proceed.
The Phase 3 study will be conducted in a medically unmonitored setting (e.g., at-home) in a manner very similar to the conduct of our Phase 3 development program for PSVT. The Phase 3 AFib-RVR study will enroll patients with a history of symptomatic AFib episodes, and will use a self-administered, repeat-dose regimen of 70 mg per dose (the dose and dosing approach that was studied in the RAPID trial in patients with PSVT). The Phase 3 study’s target population will be patients with verified history of AFib-RVR, and the ITT population will be all patients self-administering the study drug for perceived AFib-RVR. The primary endpoint is the mean change from baseline ventricular rate to nadir ventricular rate for patients treated with etripamil versus placebo, as was studied in the ReVeRA trial in AFib-RVR. The key secondary endpoint will be based on a PRO of symptomatic improvement, discussed with the FDA, which is similar to the PRO questions utilized in our PSVT and AFib-RVR programs. The study has been powered and sized based upon approximately 150 events from 150 unique patients with a history of symptomatic episodes of AFib-RVR.
AFib-RVR Market Overview
Atrial Fibrillation, or “AFib,” is a common cardiac arrhythmia with an irregular and often rapid heart rate that is often markedly symptomatic and, without proper treatment, can increase the risk of stroke, heart failure, and other cardiovascular complications. A common complication of AFib is a rapid heart rate, also referred to as AFib-RVR, which is frequently defined as a heart rate ≥ 110 beats per minute. The occurrence of a rapid ventricular rate, or “RVR,” in patients with atrial fibrillation increases the likelihood of marked symptoms including heart palpitations, shortness of breath and weakness. There are two commonly used pharmacological approaches to chronically manage AFib, rhythm control and rate control. Regardless of the chronic approach, break-through episodes of rapid heart rate occur frequently; and when faced with a sudden episode of AFib-RVR, acute rate control is needed, with most treatments being AV-nodal targeted drugs such as a beta blocker or calcium channel blocker. These treatments can be given intravenously; however, this requires a burdensome trip to an emergency department which may lead to a hospital admission. Acute treatment can be attempted by administration of an oral rate control drug; however, such drugs do not adequately provide immediate or dependable enough ventricular rate control due to a 30- to 90-minute delayed onset of action, and, as a result, many patients need faster
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and more certain rate-reduction and symptom-resolution and so seek acute-medical care by going to the emergency department for treatment utilizing intravenous rate control and/or electrical cardioversion of their atrial fibrillation. Furthermore, the chronic administration of oral rate-control drugs does not broadly prevent episodes of AFib-RVR. Similar to PSVT, patients may feel a loss of control by needing to visit the emergency department for overcoming their AFib-RVR episode and the unpredictable nature of these episodes, which can occur anytime and anywhere. Doctors have expressed frustration at the lack of options for patients to self-manage these acute rate attacks; and payor organizations would prefer to treat the AFib-RVR attacks in a more cost effective and time-efficient manner.
An estimated 10 million Americans suffer from AFib. The prevalence of AFib is expected to grow to greater than 12 million by 2030. A subset of patients with AFib experiences episodes of abnormally high heart rate, most often accompanied by palpitations, shortness of breath, dizziness, and weakness. While these episodes, known as AFib-RVR, may be treated by oral calcium channel blockers and/or beta blockers, patients frequently seek acute care in the ED to address symptoms. In 2019, nearly 1.1 million patients were admitted to the ED due to AFib symptoms. Initial data suggests that approximately 60% of all AFib ED visits were attributable to AFib-RVR, as symptoms driving patients to seek care generally become more pronounced at higher heart rates. Treatment for such symptoms typically includes medically supervised intravenous administration of calcium channel blockers or beta blockers, or electrical cardioversion. With little available data for AFib-RVR, we believe, based on our initial market research, that 30% to 40% of patients with AFib experience one or more symptomatic episodes of RVR per year that require treatment, suggesting a current target addressable market of approximately three to four million patients for etripamil in patients with AFib-RVR.
We believe that etripamil has the potential to be developed such that it can be used by patients to rapidly reduce their heart rate to provide a supplemental option to either the acute oral rate or rhythm control strategy their physician would use. When presented with a target product profile reflecting this potential use case, cardiologists and electrophysiologists, in a 2021 market research study perceived utility in the product profile and indicated that they would prescribe to approximately two-thirds of their patients that experience episodes of AFib-RVR. They further indicated that a rapidly-acting intranasal calcium channel blocker could serve as a “bridge” to the longer onset times of acute oral agents. According to physicians, it can take hours for patients to feel an alleviation of symptoms using acute oral rate or rhythm control. During this time, patients may experience concerning symptoms that often prompt them to seek emergency care. We believe that the combination of convenient delivery, potency, rapid onset and short duration of action of etripamil has the potential to move the current treatment setting for some acute episodes of AFib out of the burdensome and costly emergency department.
Current AFib management consumes significant healthcare resources in the United States. The American Heart Association published a report in 2016 summarizing the current and projected cost burden of cardiovascular diseases in the United States. This report suggests atrial fibrillation resulted in $25 billion in direct medical costs in 2016 (approximately 7% of all cardiovascular diseases) and another $7 billion in indirect costs (i.e., up to $32 billion in total costs). Additionally, the forecasted growth in atrial fibrillation prevalence is anticipated to result in healthcare expenditures of $46 billion in direct costs and $10 billion in indirect costs in the United States by 2030.
Our Strategy
Our goal is to identify, develop, and commercialize innovative cardiovascular medicines, including etripamil for the treatment of PSVT, AFib-RVR, and other cardiovascular indications, and potentially including additional clinical stage compounds for other cardiovascular conditions. The key elements of our business strategy to achieve this goal include the following:
• Maximize the value of our launch of CARDAMYST in the United States. We have launched CARDAMYST by building out our sales team of approximately 60 sales representatives who will be targeting cardiology and high value primary care healthcare providers who we believe will treat up to an estimated 500,000 patients with a diagnosis of PSVT during 2026. We have implemented retail distribution and target most of our launch year marketing mix on increasing healthcare professional, or “HCP,” awareness and the number of trials of CARDAMYST.
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• Expand the scope of cardiovascular indications for etripamil beyond PSVT. We are investigating, through a completed Phase 2 study and an upcoming Phase 3 study, the use of etripamil for the treatment of patients with AFib-RVR. We believe that etripamil could benefit patients with AFib-RVR based on the approved use of IV calcium channel blockers in this indication. We also intend to explore additional cardiovascular opportunities for the use of etripamil.
• Successfully complete development and obtain regulatory approval of etripamil in other major markets. We are currently seeking regulatory approval in China through our partner, Corxel. We intend to seek regulatory approvals in other major markets through additional strategic partnerships.
• Leverage our expertise and experience to expand our pipeline of product candidates. We seek to maximize our commercial opportunities by acquiring or in-licensing product candidates for indications with significant unmet need with a focus on novel treatments for cardiovascular or other conditions. Our leadership team has extensive experience in developing and commercializing successful drugs and has developed a deep understanding of the PSVT and Atrial Fibrillation markets. We intend to leverage the collective talent within our organization and our network to guide our development plans and pipeline expansion.
Etripamil in Other Therapeutic Applications
Our goal in expanding our pipeline around etripamil is to apply the same paradigm-changing aspiration that we have for supraventricular tachycardias, like PSVT and AFib-RVR, to other cardiac and potentially non-cardiac conditions where we believe that a rapid-onset dihydropyridine L-type calcium channel blocker could potentially deliver significant clinical and quality of life benefits for patients. We believe that the insights that led to the development of etripamil for the treatment of PSVT are relevant in other indications where AV-nodal blocking agents with blood vessel widening activity have demonstrated clinical utility. Both calcium channel blockers and beta blockers are commonly used to manage supraventricular tachycardias like PSVT or AFib-RVR, and other conditions.
Sales and Marketing
We are commercializing CARDAMYST in the United States by targeting high volume healthcare providers, primarily cardiologists, with a focused specialty sales force supported by digital/omnichannel investments and robust reimbursement and patient support. Specifically, the launch of CARDAMYST is being led by a focused national field force calling on approximately 8,000 clinical/interventional cardiologists, 1,500 electrophysiologists, and 500 primary care physicians who treat large populations of patients with PSVT, supported by strategic investments in medical affairs, digital/targeted non-personal promotion, and robust reimbursement and patient support programs. Although we will initially focus on obtaining broad commercial insurance coverage from large Pharmacy Benefit Managers, or “PBMs,” and targeted national and regional commercial payors, as we expand reimbursement for CARDAMYST to include government payors and targeted integrated delivery networks we anticipate that this investment in omnichannel promotion will grow, targeting both prescribers and patients. As we expand, we believe our field force could potentially grow to call on up to 25,000 clinical cardiologists, interventional cardiologists, electrophysiologists, and high-volume primary care physicians/advanced practice providers who have a history of prescribing cardiovascular therapies. We believe an organization of this size could potentially allow us to reach prescribers that collectively care for most patients diagnosed with PSVT in the United States. Given the importance of increasing awareness and educating patients with PSVT, as we establish favorable broad payor reimbursement, we also anticipate deploying focused direct-to-patient marketing campaigns for CARDAMYST.
We anticipate that our sales force could also support the commercialization of additional product candidates treating cardiovascular diseases through partnerships and/or co-promotion deals. In addition, we may pursue and believe that we can maximize the value of etripamil by entering into collaboration agreements for certain territories outside the United States, including the European Union, while retaining commercialization rights in the United States.
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Manufacturing of Commercial Supply
We do not have any manufacturing facilities. We rely on, and expect to continue to rely on, third party contract manufacturing organizations, or “CMOs,” for all of our required raw materials, nasal spray device, active pharmaceutical ingredient, or “API,” and finished product for our commercial product, clinical trials and for our preclinical research. We require all of our CMOs to conduct manufacturing activities in compliance with current good manufacturing practice, or “cGMP,” requirements. We have assembled a team of experienced employees and consultants to provide the necessary technical, quality, and regulatory oversight over our CMOs and have implemented a comprehensive plan for audits of our CMOs. Currently, we have contracts and quality agreements with our CMOs for the manufacturing of etripamil drug substance and drug product. We believe we currently have enough manufactured supply of etripamil to support our commercial launch. We also may elect to pursue additional CMOs for manufacturing supplies of regulatory starting materials in the future and for the filling of the nasal spray device, labeling, packaging, storage, and distribution of investigational and commercial drug products. We plan to continue to rely on third party manufacturers for any future trials and commercialization of etripamil. We anticipate that these CMOs will have capacity to support commercial scale production.
Competition
Drug development is highly competitive and subject to rapid and significant technological advancements. Our ability to compete will significantly depend upon our ability to complete necessary clinical trials, regulatory approval processes, and effectively market any drug that we may successfully develop. Our current and potential future competitors include pharmaceutical and biotechnology companies, academic institutions, and government agencies. The primary competitive factors that will affect the commercial success of etripamil or any other product candidate for which we may receive marketing approval, include differentiation of any competitor’s product regarding efficacy, safety, tolerability, dosing convenience, price, coverage, and reimbursement. A number of our potential competitors have substantially greater financial, technical, and human resources than we do and significantly greater experience in the discovery and development of product candidates, as well as in obtaining regulatory approvals and commercializing those product candidates in the United States and in foreign countries. It is also possible that a competitor may develop a cure or more effective treatment method for the diseases we are targeting, which could render our current or future product candidates non-competitive or obsolete, or reduce the demand for our product candidates before we can recover our development and commercialization expenses.
We are not aware of any approved drug or any drug candidate in clinical development for a patient with PSVT to self-administer treatment to terminate PSVT episodes. In the acute setting, IV treatments of generic drugs such as adenosine, verapamil, and diltiazem, are routinely given. Additionally, some practitioners prescribe oral medications, such as calcium channel blockers, beta blockers and antiarrhythmics to be taken at the onset of an episode. However, these interventions are not acutely effective and are not approved by the FDA or other regulatory agencies for this use.
For AFib, there are a number of marketed generic antiarrhythmic drugs that are used for chronic and/or acute rate control, such as metoprolol, propranolol, esmolol, pindolol, atenolol, nadolol, verapamil, and diltiazem. For acute rate control, the intravenous forms of these drugs are the ones most often used. We are aware of several drugs or new formulations of existing drugs under development or recently under development for atrial fibrillation, including InRhythm (flecainide), a sodium channel blocker in Phase 3 from InCarda Therapeutics, Inc., and an IV and potentially oral small-molecule SK channel inhibitor being developed by Acesion Pharma for acute conversion and chronic maintenance of sinus rhythm, respectively, in patients with AFib. Acesion’s lead asset, AAP30663, is the IV-formulated short acting AFib conversion therapy for hospital use that has successfully completed a Phase 2 trial. Rapiblyk (landiolol) is an intravenous beta blocker approved for the short-term reduction of ventricular rate with supraventricular tachycardia including atrial fibrillation and atrial flutter.
Intellectual Property
We have filed numerous patent applications pertaining to etripamil and possible future product candidates, formulations containing etripamil, methods of making such formulations, and clinical use. We strive to protect and enhance the
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proprietary technology, invention, and improvements that are commercially important to the development of our business by seeking, maintaining, and defending our intellectual property. We also rely on know-how, continuing technological innovation and potential in-licensing opportunities to develop, strengthen, and maintain our position in the field of cardiac arrhythmias, such as PSVT, and immediate rate control in atrial fibrillation, as well as other medical conditions affecting the cardiovascular system. Additionally, we intend to rely on regulatory protection afforded through data exclusivity and market exclusivity, as well as patent term extensions, where available.
As of December 31, 2025, our patent portfolio as it pertains to etripamil included:
• a patent family containing six U.S. patents, projected to expire in 2028, a pending U.S. patent application, which, if granted, is projected to expire in 2028, as well as corresponding patents in Australia, Brazil, Canada, China, Europe, Hong Kong, India, Japan, Mexico, New Zealand, and South Korea, directed to etripamil, pharmaceutical compositions including etripamil, and uses of etripamil such as to treat cardiac arrhythmias, including PSVT and atrial fibrillation; and
• a patent family containing one U.S. patent, projected to expire in 2036, a pending U.S. patent application, which, if granted, is projected to expire in 2036, as well as corresponding patents in Australia, Brazil, Canada, China, Europe, Hong Kong, Israel, Japan, Macau, Mexico, Russia, South Africa, South Korea and Ukraine and corresponding patent applications in China, Europe, Hong Kong, and New Zealand, directed to formulations including etripamil, methods of making such formulations, and uses of such formulations to treat cardiac arrhythmias, such as PSVT and atrial fibrillation.
• a patent family containing one U.S. patent, projected to expire in 2042, a pending U.S. application which, if granted, is projected to expire in 2042, and pending applications in Canada and Europe, which, if granted, are projected to expire in 2041 in Canada and 2042 in Europe, directed to uses of formulations including etripamil to treat cardiac arrhythmias, such as PSVT and atrial fibrillation, or migraines.
The terms of individual patents may vary based on the countries in which they are obtained. Generally, patents issued for applications filed in the United States are effective for 20 years from the earliest effective non-provisional filing date in the absence, for example, of a terminal disclaimer shortening the term of the patent or patent term adjustment increasing the term of the patent. In addition, in certain instances, a patent term can be extended to recapture a portion of the term effectively lost as a result of FDA regulatory review periods. The restoration period cannot be longer than five years and the total term, including the restoration period, must not exceed 14 years following FDA approval. The duration of patents outside the United States varies in accordance with provisions of applicable local law, but typically is also 20 years from the earliest non-provisional filing date.
In addition to patents and patent applications that we own, we rely on know-how to develop and maintain our competitive position. We seek to protect our proprietary technology and processes, and obtain and maintain ownership of certain technologies, in part, through confidentiality agreements and invention assignment agreements with our employees, consultants, scientific advisors, contractors, and commercial partners.
Our future commercial success depends, in part, on our ability to obtain and maintain patent and other proprietary protection for commercially important technology, inventions and know-how related to our business; defend and enforce our patents; and operate without infringing valid enforceable patents and proprietary rights of third parties. Our ability to stop third parties from making, using, selling, offering to sell, or importing our products may depend on the extent to which we have rights under valid and enforceable patents that cover these activities. With respect to our owned intellectual property, we cannot be sure that patents will issue from any of the pending patent applications which we own or from any patent applications that we may file in the future, nor can we be sure that any patents that may be issued in the future to us will be commercially useful in protecting etripamil or any future product candidates and methods of using or manufacturing the same. Moreover, we may be unable to obtain patent protection for certain aspects of etripamil or future product candidates generally, as well as with respect to certain indications. See the section entitled “Risk Factors—Risks Related to Our Intellectual Property” for a more comprehensive description of risks related to our intellectual property.
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Government Regulation and Product Approval
Government authorities in the United States at the federal, state, and local levels, and in other countries, extensively regulate, among other things, the research, development, testing, manufacture, packaging, storage, recordkeeping, labeling, advertising, promotion, distribution, marketing, import, and export of pharmaceutical products, such as those we are developing. The processes for obtaining regulatory approvals in the United States and in foreign countries, along with subsequent compliance with applicable statutes and regulations, require the expenditure of substantial time and financial resources.
United States Government Regulation
In the United States, the FDA regulates drugs under the Federal Food, Drug, and Cosmetic Act, or “FDCA,” and its implementing regulations. The process of obtaining regulatory approvals and the subsequent compliance with appropriate federal, state, local and foreign statutes and regulations require the expenditure of substantial time and financial resources. Failure to comply with the applicable United States requirements at any time during the drug development process, approval process or after approval, may subject an applicant to a variety of administrative or judicial sanctions, such as the FDA’s refusal to approve an NDA, withdrawal of an approval, imposition of a clinical hold, issuance of warning or untitled letters, product recalls, product seizures, total or partial suspension of production or distribution, injunctions, fines, refusals of government contracts, restitution, disgorgement, or civil or criminal penalties.
The process required by the FDA before a drug may be marketed in the United States generally involves:
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completion of preclinical laboratory tests, animal studies and formulation studies in compliance with the FDA’s good laboratory practice, or “GLP,” regulations;
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submission to the FDA of an IND, which must become effective before human clinical trials may begin;
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approval by an independent institutional review board, or “IRB,” at each clinical site before each trial may be initiated;
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performance of adequate and well controlled clinical trials, in accordance with good clinical practice, or “GCP,” requirements to establish the safety and efficacy of the proposed drug for each indication;
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submission to the FDA of an NDA;
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satisfactory completion of an FDA advisory committee review, if applicable;
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satisfactory completion of an FDA inspection of the manufacturing facility or facilities at which the product is produced to assess compliance with cGMP requirements, and to assure that the facilities, methods and controls are adequate to preserve the drug’s identity, strength, quality, and purity;
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satisfactory completion of an FDA inspection of selected clinical sites to assure compliance with GCPs and the integrity of the clinical data;
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payment of user fees; and
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FDA review and approval of the NDA.
Preclinical Studies
Preclinical studies include laboratory evaluation of product chemistry, toxicity, and formulation, as well as animal studies to assess potential safety and efficacy. An IND sponsor must submit the results of the nonclinical tests, together with
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manufacturing information, analytical data, and any available clinical data or literature, among other things, to the FDA as part of an IND. Some nonclinical testing may continue even after the IND is submitted. An IND automatically becomes effective 30 days after receipt by the FDA, unless before that time the FDA raises concerns or questions related to one or more proposed clinical trials and places the clinical trial on a clinical hold.
In such a case, the IND sponsor and the FDA must resolve any outstanding concerns before the clinical trial can begin. As a result, submission of an IND may not result in the FDA allowing clinical trials to commence.
Clinical Trials
Clinical trials involve the administration of the investigational new drug to human subjects under the supervision of qualified investigators in accordance with GCP requirements, which include the requirement that all research subjects provide their informed consent in writing for their participation in any clinical trial. Clinical trials are conducted under protocols detailing, among other things, the objectives of the trial, the parameters to be used in monitoring safety and the effectiveness criteria to be evaluated. A protocol for each clinical trial and any subsequent protocol amendments must be submitted to the FDA as part of the IND. In addition, an IRB at each institution participating in the clinical trial must review and approve the plan for any clinical trial before it commences at that institution, and the IRB must continue to oversee the clinical trial while it is being conducted. Information about certain clinical trials must be submitted within specific timeframes to the National Institutes of Health, or “NIH,” for public dissemination on their ClinicalTrials.gov website.
Human clinical trials are typically conducted in three sequential phases, which may overlap or be combined. In Phase 1, the drug is initially introduced into healthy human subjects or patients with the target disease or condition and tested for safety, dosage tolerance, absorption, metabolism, distribution, excretion and, if possible, to gain an initial indication of its effectiveness. In Phase 2, the drug typically is administered to a limited patient population to identify possible adverse effects and safety risks, to preliminarily evaluate the efficacy of the product for specific targeted diseases and to determine dosage tolerance and optimal dosage. In Phase 3, the drug is administered to an expanded patient population, generally at geographically dispersed clinical trial sites, in well controlled clinical trials to generate enough data to statistically evaluate the safety and efficacy of the product for approval, to establish the overall risk benefit profile of the product and to provide adequate information for the labeling of the product.
Progress reports detailing the results of the clinical trials must be submitted, at least annually, to the FDA, and more frequently if serious adverse events occur. Phase 1, Phase 2, and Phase 3 clinical trials may not be completed successfully within any specified period, or at all. Furthermore, the FDA or the sponsor may suspend or terminate a clinical trial at any time on various grounds, including a finding that the research subjects are being exposed to an unacceptable health risk. Similarly, an IRB can suspend or terminate approval of a clinical trial at its institution if the clinical trial is not being conducted in accordance with the IRB’s requirements, or if the drug has been associated with unexpected serious harm to patients.
Marketing Approval
Assuming successful completion of the required clinical testing, the results of the preclinical and clinical studies, together with detailed information relating to the product’s chemistry, manufacture, controls, and proposed labeling, among other things, are submitted to the FDA as part of an NDA requesting approval to market the product for one or more indications. In most cases, the submission of an NDA is subject to a substantial application user fee. Under the PDUFA guidelines that are currently in effect, the FDA has a goal of ten months from the date of “filing” of a standard NDA for a new molecular entity to review and act on the submission. This review typically takes twelve months from the date the NDA is submitted to the FDA because the FDA has approximately two months to make a “filing” decision.
In addition, under the Pediatric Research Equity Act, certain NDAs or supplements to an NDA must contain data that are adequate to assess the safety and effectiveness of the drug for the claimed indications in all relevant pediatric subpopulations, and to support dosing and administration for each pediatric subpopulation for which the product is safe and effective. The FDA may, on its own initiative or at the request of the applicant, grant deferrals for submission of some
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or all pediatric data until after approval of the product for use in adults, or full or partial waivers from the pediatric data requirements. Unless otherwise required by regulation, the pediatric data requirements do not apply to products with orphan designation.
The FDA also may require submission of a risk evaluation and mitigation strategy, or “REMS,” plan to ensure that the benefits of the drug outweigh its risks. The REMS plan could include medication guides, physician communication plans, assessment plans, and/or elements to assure safe use, such as restricted distribution methods, patient registries, or other risk minimization tools.
The FDA conducts a preliminary review of all NDAs within the first 60 days after submission, before accepting them for filing, to determine whether they are sufficiently complete to permit substantive review. The FDA may request additional information rather than accept an NDA for filing. In this event, the application must be resubmitted with the additional information. The resubmitted application is also subject to review before the FDA accepts it for filing. Once the submission is accepted for filing, the FDA begins an in-depth substantive review. The FDA reviews an NDA to determine, among other things, whether the drug is safe and effective and whether the facility in which it is manufactured, processed, packaged or held meets standards designed to assure the product’s continued safety, quality and purity.
The FDA may refer an application for a novel drug to an advisory committee. An advisory committee is a panel of independent experts, including clinicians and other scientific experts, that reviews, evaluates, and provides a recommendation as to whether the application should be approved and under what conditions. The FDA is not bound by the recommendations of an advisory committee, but it considers such recommendations carefully when making decisions.
Before approving an NDA, the FDA typically will inspect the facility or facilities where the product is manufactured. The FDA will not approve an application unless it determines that the manufacturing processes and facilities are in compliance with cGMP requirements and adequate to assure consistent production of the product within required specifications. Additionally, before approving an NDA, the FDA will typically inspect one or more clinical trial sites to assure compliance with GCP requirements.
After evaluating the NDA and all related information, including the advisory committee recommendation, if any, and inspection reports regarding the manufacturing facilities and clinical trial sites, the FDA may issue an approval letter, or, in some cases, a complete response letter. A complete response letter generally contains a statement of specific conditions that must be met in order to secure final approval of the NDA and may require additional clinical or preclinical testing in order for FDA to reconsider the application. Even with submission of this additional information, the FDA ultimately may decide that the application does not satisfy the regulatory criteria for approval. If and when those conditions have been met to the FDA’s satisfaction, the FDA will typically issue an approval letter. An approval letter authorizes commercial marketing of the drug with specific prescribing information for specific indications.
Even if the FDA approves a product, it may limit the approved indications for use of the product, require that contraindications, warnings, or precautions be included in the product labeling, require that post-approval studies, including Phase 4 clinical trials, be conducted to further assess a drug’s safety after approval, require testing, and surveillance programs to monitor the product after commercialization, or impose other conditions, including distribution and use restrictions or other risk management mechanisms under a REMS, which can materially affect the potential market and profitability of the product. The FDA may prevent or limit further marketing of a product based on the results of post-marketing studies or surveillance programs. After approval, some types of changes to the approved product, such as adding new indications, manufacturing changes, and additional labeling claims, are subject to further testing requirements and FDA review and approval.
Post-Approval Requirements
Drugs manufactured or distributed pursuant to FDA approvals are subject to pervasive and continuing regulation by the FDA, including, among other things, requirements relating to recordkeeping, periodic reporting, product sampling and distribution, advertising, and promotion and reporting of adverse experiences with the product. After approval, most changes to the approved product, such as adding new indications, manufacturing changes or other labeling claims, are
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subject to further testing requirements and prior FDA review and approval. There also are continuing annual user fee requirements for any marketed products and the establishments at which such products are manufactured, as well as application fees for supplemental applications with clinical data. The FDA may prevent or limit further marketing of a product based on the results of post-marketing studies or surveillance programs.
In addition, drug manufacturers and other entities involved in the manufacture and distribution of approved drugs are required to register their establishments with the FDA and state agencies, and are subject to periodic unannounced inspections by the FDA and these state agencies for compliance with cGMP requirements. Changes to the manufacturing process are strictly regulated and often require prior FDA approval before being implemented. FDA regulations also require investigation and correction of any deviations from cGMP and impose reporting and documentation requirements upon the sponsor and any third-party manufacturers that the sponsor may decide to use. Accordingly, manufacturers must continue to expend time, money, and effort in the area of production and quality control to maintain cGMP compliance.
Once an approval is granted, the FDA may withdraw the approval if compliance with regulatory requirements and standards is not maintained or if problems occur after the product reaches the market.
Later discovery of previously unknown problems with a product, including adverse events of unanticipated severity or frequency, or with manufacturing processes, or failure to comply with regulatory requirements, may result in mandatory revisions to the approved labeling to add new safety information; imposition of post-market studies or clinical trials to assess new safety risks, or imposition of distribution or other restrictions under a REMS program. Other potential consequences include, among other things:
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restrictions on the marketing or manufacturing of the product, complete withdrawal of the product from the market, or product recalls;
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fines, warning letters or holds on post-approval clinical trials;
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refusal of the FDA to approve pending NDAs or supplements to approved NDAs, or suspension or revocation of product approvals;
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product seizure or detention, or refusal to permit the import or export of products; or
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injunctions or the imposition of civil or criminal penalties.
The FDA strictly regulates marketing, labeling, advertising and promotion of products that are placed on the market. Drugs may be promoted only for the approved indications and in accordance with the provisions of the approved label, although physicians, based on their independent medical judgement, may prescribe approved drugs for unapproved (or “off-label”) indications. The FDA and other agencies actively enforce the laws and regulations prohibiting their promotion of off-label uses, and a company that is found to have improperly promoted off-label uses may be subject to significant civil, criminal and administrative liability.
In addition, the distribution of prescription pharmaceutical products is subject to the Drug Supply Security Chain Act, which regulates the distribution of drugs and drug samples at the federal level, and sets minimum standards for the registration and regulation of drug distributors by the states.
Federal and State Fraud and Abuse, Data Privacy and Security, and Transparency Laws and Regulations
In addition to FDA restrictions on marketing of pharmaceutical products, federal and state healthcare laws and regulations restrict business practices in the biopharmaceutical industry. These laws regulate, among other things, our current and future business operations, including our clinical research activities, sales, marketing, and education programs. These laws may also constrain the business or financial arrangements and relationships with healthcare providers and other parties through which we market, sell, and distribute our products for which we obtain marketing approval. These laws include
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anti-kickback and false claims laws and regulations, data privacy and security laws and regulations, and transparency laws and regulations, including, without limitation, those laws described below.
The federal Anti-Kickback Statute prohibits any person or entity from, among other things, knowingly and willfully offering, paying, soliciting, or receiving remuneration to induce or in return for purchasing, leasing, ordering, or arranging for or recommending the purchase, lease, or order of any item or service reimbursable under Medicare, Medicaid, or other federal healthcare programs. The term “remuneration” has been broadly interpreted to include anything of value. The federal Anti-Kickback Statute has been interpreted to apply to arrangements between pharmaceutical manufacturers, on the one hand, and prescribers, purchasers, and formulary managers on the other. There are a number of statutory exceptions and regulatory safe harbors protecting some common activities from prosecution. Practices that involve remuneration that may be alleged to be intended to induce prescribing, purchases or recommendations may be subject to scrutiny if they do not qualify for an exception or safe harbor. Several courts have interpreted the statute’s intent requirement to mean that if any one purpose of an arrangement involving remuneration is to induce referrals of federal healthcare covered business, the statute has been violated.
A person or entity does not need to have actual knowledge of this statute or specific intent to violate it in order to have committed a violation. In addition, the government may assert that a claim including items or services resulting from a violation of the federal Anti-Kickback Statute constitutes a false or fraudulent claim for purposes of the federal civil False Claims Act or the civil monetary penalties laws.
Federal civil and criminal false claims laws, including the federal civil False Claims Act, which can be enforced by individuals through civil whistleblower and qui tam actions and civil monetary penalties laws, prohibit any person or entity from, among other things, knowingly presenting, or causing to be presented, a false claim for payment to the federal government or knowingly making, using or causing to be made or used a false record or statement material to a false or fraudulent claim to the federal government. A claim includes “any request or demand” for money or property presented to the U.S. government. Several pharmaceutical and other healthcare companies have been prosecuted under these laws for allegedly providing free product to customers with the expectation that the customers would bill federal programs for the product. Other companies have been prosecuted for causing false claims to be submitted because of the companies’ marketing of products for unapproved, and thus non-reimbursable, uses.
The federal Health Insurance Portability and Accountability Act of 1996, or “HIPAA,” created additional federal criminal statutes that prohibit, among other things, knowingly and willfully executing a scheme to defraud any healthcare benefit program, including private third-party payors and knowingly and willfully falsifying, concealing or covering up a material fact or making any materially false, fictitious, or fraudulent statement in connection with the delivery of or payment for healthcare benefits, items or services. Also, many states have similar fraud and abuse statutes or regulations that apply to items and services reimbursed under Medicaid and other state programs, or, in several states, apply regardless of the payor.
In addition, we are subject to data privacy and security regulation by both the federal government and the states in which we conduct our business. HIPAA, as amended by the Health Information Technology for Economic and Clinical Health Act, or “HITECH,” and their respective implementing regulations, impose specified requirements on certain types of individuals and entities relating to the privacy, security, and transmission of individually identifiable health information. Among other things, HITECH makes HIPAA’s security standards directly applicable to “business associates,” defined as independent contractors or agents of covered entities, which include certain healthcare providers, healthcare clearinghouse and health plans, that create, receive, maintain, or transmit individually identifiable health information in connection with providing a service for or on behalf of a covered entity, and their covered subcontractors. HITECH also increased the civil and criminal penalties that may be imposed against covered entities, business associates, and possibly other persons, and gave state attorneys general new authority to file civil actions for damages or injunctions in federal courts to enforce HIPAA and seek attorney’s fees and costs associated with pursuing federal civil actions. In addition, state laws govern the privacy and security of health information in certain circumstances, many of which are not preempted by HIPAA, differ from each other in significant ways and may not have the same effect, thus complicating compliance efforts.
The federal Physician Payments Sunshine Act requires certain manufacturers of drugs, devices, biologics and medical supplies for which payment is available under Medicare, Medicaid or the Children’s Health Insurance Program, with
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specific exceptions, to report annually to the Centers for Medicare & Medicaid Services, or “CMS,” information related to payments or other transfers of value made to physicians (defined to include doctors, dentists, optometrists, podiatrists and chiropractors), other healthcare professionals (such as physician assistants and nurse practitioners), and teaching hospitals, and applicable manufacturers and applicable group purchasing organizations to report annually to CMS ownership and investment interests held by physicians and their immediate family members.
We may also be subject to state laws that require pharmaceutical companies to comply with the pharmaceutical industry’s voluntary compliance guidelines and the relevant compliance guidance promulgated by the federal government, state laws that require drug manufacturers to report information related to payments and other transfers of value to physicians and other healthcare providers or marketing expenditures, state laws that require drug manufacturers to report information on the pricing of certain drugs, and state and local laws that require certain regulatory licenses to manufacture or distribute our products commercially and/or the registration of pharmaceutical sales representatives.
Because of the breadth of these laws, it is possible that some of our business activities could be subject to challenge under one or more of such laws. There are a number of statutory exceptions and regulatory safe harbors protecting some common activities from prosecution. If our operations are found to be in violation of any of the federal and state laws described above or any other governmental regulations that apply to us, we may be subject to significant criminal, civil and administrative penalties including damages, fines, imprisonment, additional reporting requirements and oversight if we become subject to a corporate integrity agreement or similar agreement to resolve allegations of non-compliance with these laws, contractual damages, reputational harm, diminished profits and future earnings, disgorgement, exclusion from participation in government healthcare programs and the curtailment or restructuring of our operations, any of which could adversely affect our ability to operate our business and our results of operations. To the extent that any of our products are sold in a foreign country, we may be subject to similar foreign laws and regulations, which may include, for instance, applicable post-marketing requirements, including safety surveillance, anti-fraud and abuse laws, implementation of corporate compliance programs, reporting of payments or transfers of value to healthcare professionals, and additional data privacy and security requirements.
Coverage and Reimbursement
The future commercial success of our, or any of our collaborators’, product candidates, if approved, will depend in part on the extent to which third-party payors, such as governmental payor programs at the federal and state levels, including Medicare and Medicaid, private health insurers and other third-party payors, provide coverage of and establish adequate reimbursement levels for our product candidates. Third-party payors generally decide which products they will pay for and establish reimbursement levels for those products. In particular, in the United States, no uniform policy for coverage and reimbursement exists. Private health insurers and other third-party payors often provide coverage and reimbursement for products based on the level at which the government, through the Medicare program, provides coverage and reimbursement for such products, but also have their own methods and approval process apart from Medicare determinations. Therefore, coverage and reimbursement can differ significantly from payor to payor.
In the United States, the European Union, or “EU,” and other potentially significant markets for our product candidates, government authorities and third-party payors are increasingly attempting to limit or regulate the price of products, particularly for new and innovative products, which often has resulted in average selling prices lower than they would otherwise be. Further, the increased emphasis on managed healthcare in the United States and on country and regional pricing and reimbursement controls in the EU will put additional pressure on product pricing, reimbursement and usage. These pressures can arise from rules and practices of managed care groups, judicial decisions and laws and regulations related to Medicare, Medicaid and healthcare reform, pharmaceutical coverage and reimbursement policies and pricing in general. Further, the U.S. Department of Health and Human Services, or “HHS,” imposes rebates on many Medicare Part B and Medicare Part D products to penalize price increases that outpace inflation on an annual basis. HHS has also been empowered to negotiate the price of certain single-source drugs that have been on the market for at least seven (7) years covered under Medicare as part of the Medicare Drug Price Negotiation Program. Each year up to twenty (20) products will be selected by HHS for the Medicare Drug Price Negotiation Program. Products subject to the Medicare Drug Price Negotiation Program are expected to experience a significant reduction in reimbursement from the Medicare program on a per unit basis.
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Third-party payors are increasingly imposing additional requirements and restrictions on coverage and limiting reimbursement levels for products. For example, federal and state governments reimburse products at varying rates generally below average wholesale price. These restrictions and limitations influence the purchase of products. Third-party payors may limit coverage to specific products on an approved list, or formulary, which might not include all of the FDA-approved products for a particular indication. Third-party payors are increasingly challenging the price and examining the medical necessity and cost-effectiveness of products, in addition to their safety and efficacy. We may need to conduct expensive pharmacoeconomic studies in order to demonstrate the medical necessity and cost-effectiveness of our product candidates, in addition to the costs required to obtain the FDA approvals. Our product candidates may not be considered medically necessary or cost-effective. A payor’s decision to provide coverage for a product does not imply that an adequate reimbursement rate will be approved. Adequate third-party payor reimbursement may not be available to enable us to realize an appropriate return on our investment in product development. Legislative proposals to reform healthcare or reduce costs under government insurance programs may result in lower reimbursement for our product candidates, if approved, or exclusion of our product candidates from coverage and reimbursement. The cost containment measures that third-party payors and providers are instituting and any healthcare reform could significantly reduce our revenues from the sale of any approved product candidates. Even if favorable coverage and reimbursement status is attained for one or more products for which we receive regulatory approval, less favorable coverage policies and reimbursement rates may be implemented in the future.
Healthcare Reform
The United States and some foreign jurisdictions are considering enacting or have enacted a number of additional legislative and regulatory proposals to change the healthcare system in ways that could affect our ability to sell our product candidates profitably, if approved. Among policy makers and payors in the United States and elsewhere, there is significant interest in promoting changes in healthcare systems with the stated goals of containing healthcare costs, improving quality and expanding access. In the United States, the pharmaceutical industry has been a particular focus of these efforts, which include major legislative initiatives to reduce the cost of care through changes in the healthcare system, including limits on the pricing, coverage, and reimbursement of pharmaceutical and biopharmaceutical products, especially under government-funded health care programs, and increased governmental control of drug pricing.
There have been several U.S. government initiatives over the past few years to fund and incentivize certain comparative effectiveness research, including creation of the Patient-Centered Outcomes Research Institute under the Patient Protection and Affordable Care Act of 2010, as amended by the Health Care and Education Reconciliation Act of 2010, or collectively the “PPACA.” It is also possible that comparative effectiveness research demonstrating benefits in a competitor’s product could adversely affect the sales of our product candidates.
There have been amendments to, and executive, judicial and Congressional challenges to certain aspects of the Patient Protection and Affordable Care Act, or the “PPACA.” For example, on July 4, 2025, the One Big Beautiful Bill Act, or the “OBBBA,” was signed into law, which narrowed access to PPACA marketplace exchange enrollment and declined to extend the PPACA enhanced advanced premium tax credits that expired at the end of 2025, which, among other provisions in the law, are anticipated to reduce the number of Americans with health insurance. The OBBBA also is expected to reduce Medicaid spending and enrollment by implementing work requirements for some beneficiaries, capping state-directed payments, reducing federal funding, and limiting provider taxes used to fund the program. Congress is considering proposed legislation intended to further reduce healthcare costs with alternatives to replace the expired PPACA subsidies.
In addition, other legislative changes have been proposed and adopted since the PPACA was enacted. These changes include aggregate reductions to Medicare payments to providers of 2% per fiscal year, which began in 2013 and will remain in effect until 2032 unless additional Congressional action is taken.
The current administration is pursuing policies to reduce regulations and expenditures across government agencies including at HHS, the FDA, CMS and related agencies. These actions, presently directed by executive orders or memoranda from the Office of Management and Budget, may propose policy changes that create additional uncertainty for our business. For example, the current administration has announced agreements with several pharmaceutical companies that require the drug manufacturers to offer, through a direct to consumer platform, or “TrumpRx”, U.S. patients
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and Medicaid programs prescription drug Most-Favored Nation pricing equal to or lower than those paid in other developed nations, with additional mandates for direct-to-patient discounts and repatriation of foreign revenues. Other recent actions, for example, include (1) directing agencies to reduce agency workforce and cut programs; (2) directing HHS and other agencies to lower prescription drug costs through a variety of initiatives; (3) imposing tariffs on imported pharmaceutical products; and (4) as part of the Make America Healthy Again, or “MAHA”, Commission’s Strategy Report released in September 2025, working across government agencies to increase enforcement on direct-to-consumer pharmaceutical advertising. Additionally, the current administration recently called on Congress to enact "The Great Healthcare Plan," to codify and expand Most-Favored Nation pricing, lower government subsidies to private insurance companies, increase healthcare price transparency, expand pharmaceutical drugs available for over-the-counter purchase, and enact restrictions on pharmacy benefit manager, or “PBM”, payment methodologies, among other things. These actions and policies may significantly reduce U.S. drug prices, potentially impacting manufacturers’ global pricing strategies and profitability, while increasing their operational costs and compliance risks. In June 2024, the U.S. Supreme Court’s Loper Bright decision greatly reduced judicial deference to regulatory agencies, which could increase successful legal challenges to federal regulations affecting our operations. Congress may introduce and ultimately pass health care related legislation that could impact the drug approval process and make changes to the Medicare Drug Price Negotiation Program.
Individual states in the United States have also become increasingly active in passing legislation and implementing regulations designed to control pharmaceutical and biological product pricing, including price or patient reimbursement constraints, discounts, restrictions on certain product access and marketing cost disclosure and transparency measures, and, in some cases, designed to encourage importation from other countries and bulk purchasing. Legally mandated price controls on payment amounts by third-party payors or other restrictions could materially and adversely affect our business, financial condition, results of operations and prospects. In addition, regional healthcare authorities and individual hospitals are increasingly using bidding procedures to determine what pharmaceutical products and which suppliers will be included in their prescription drug and other healthcare programs. This could reduce the ultimate demand for our product candidates or put pressure on our product pricing.
Foreign Regulation
In order to market any product outside of the United States, we would need to comply with numerous and varying regulatory requirements of other countries regarding safety and efficacy and governing, among other things, clinical trials, marketing authorization, commercial sales and distribution of our product candidates. For example, in the EU, we must obtain authorization of a clinical trial application, or “CTA,” in each member state in which we intend to conduct a clinical trial. Whether or not we obtain FDA approval for a drug, we would need to obtain the necessary approvals by the comparable regulatory authorities of foreign countries before we can commence clinical trials or marketing of the drug in those countries. The approval process varies from country to country and can involve additional product testing and additional administrative review periods. The time required to obtain approval in other countries might differ from and be longer than that required to obtain FDA approval. Regulatory approval in one country does not ensure regulatory approval in another, but a failure or delay in obtaining regulatory approval in one country may negatively impact the regulatory process in others.
Employees and Human Capital
Patients inspire all we do. Our employees are passionate about creating a solution for patients who suffer from PSVT and other related illnesses as we work together on our mission to develop innovative cardiovascular medicines. We have built a culture of high performance based on our core values:
• Patients First: Everything we do is with the patient in mind. We listen to and partner with patients and place their well-being at the core of all our initiatives.
Our patients inspire us.
• Teamwork: Our employees support, challenge and care for each other.
Employees engage with one another through their teams, but also through our weekly gatherings, outings and friendly competitions and challenges.
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Collaboration is key.
• Entrepreneurial Mindset: We place a high value on grit, courage and resolve. Our organizational energy has the sense of a startup.
Employees are encouraged to think like an owner.
• Every Idea Matters: Sometimes the best ideas evolve from where it is least expected.
All ideas are welcome.
• Humility, Empathy and Integrity: We act individually and as a team with these three attributes in mind in all we do.
We care to do what is right.
Our human capital objectives include, as applicable, identifying, recruiting, retaining, incentivizing and integrating our existing and additional employees. The principal purposes of our equity incentive plans are to attract, retain and motivate selected employees, consultants and directors through the granting of stock-based compensation awards.
As of December 31, 2025, we had 38 full-time employees, 13 of whom were primarily engaged in research and development activities. Four of these employees have an M.D. or Ph.D. degree. None of our employees is represented by a labor union and we consider our employee relations to be excellent.
Facilities
Our headquarters is currently located in Montréal (Québec), Canada and consists of 7,700 square feet of leased office space under a lease that expires in November 2027. We also have a U.S. subsidiary in Charlotte, North Carolina that occupies 13,050 square feet of leased office space under a lease that expires in September 2027.
Legal Proceedings
From time to time, we may become involved in legal proceedings arising in the ordinary course of our business. We are not currently a party to any material legal proceedings, and we are not aware of any pending or threatened legal proceedings against us that we believe could have an adverse effect on our business, operating results or financial condition.
Corporate Information
Milestone Pharmaceuticals Inc. was incorporated under the laws of the province of Québec in July 2003. Our principal executive offices are located at 1111 Dr. Frederik-Philips Blvd., Suite 420, Montréal, Québec, Canada H4M 2X6, and our telephone number is (514) 336-0444. Our US offices are located at 6210 Ardrey Kell Rd, Suite 650, Charlotte, NC 28277 and our telephone number is (704) 848-5316.
Available Information
We maintain an internet website at www.milestonepharma.com and make available free of charge through our website our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and amendments to those reports filed or furnished pursuant to Sections 13(a) and 15(d) of the Exchange Act of 1934, or the “Exchange Act”. We make these reports available through our website as soon as reasonably practicable after we electronically file such reports with, or furnish such reports to, the Securities and Exchange Commission, or “SEC”. You can review our electronically filed reports and other information that we file with the SEC on the SEC’s website at http://www.sec.gov. We also make available, free of charge on our website, the reports filed with the SEC by our executive officers, directors and 10% stockholders pursuant to Section 16 under the Exchange Act as soon as reasonably practicable after copies of those filings are provided to us by those persons. In addition, we regularly use our website to post information regarding our business, product development programs and governance, and we encourage investors to use our website, particularly the information in the section entitled “Investors,” as a source of information about us.
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The information on our website is not incorporated by reference into this Annual Report on Form 10-K and should not be considered to be a part of this Annual Report on Form 10-K. Our website address is included in this Annual Report on Form 10-K as an inactive technical reference only.
Investors and others should note that we announce material information to our investors using one or more of the following: SEC filings, press releases and our corporate website, including without limitation the “Investors” and “Events and Presentations” sections of our website. We use these channels, as well as social media channels such as LinkedIn, in order to achieve broad, non-exclusionary distribution of information to the public and for complying with our disclosure obligations under Regulation FD. It is possible that the information we post on our corporate website or other social media could be deemed to be material information. Therefore, we encourage investors, the media, and others interested in our Company to review the information we post on the “Investors” and “Events and Presentations” sections of our corporate website and on our social media channels. The contents of our corporate website and social media channels are not, however, a part of this Annual Report.
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