Milestone Pharmaceuticals Inc.

Previous wording

The following information should be read in conjunction with the unaudited interim condensed consolidated statements and the notes thereto included in this Quarterly Report on Form 10-Q and the audited annual consolidated financial statements and the notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2023, which was filed with the Securities and Exchange Commission, or “SEC”, on March 21, 2024. Our actual results may differ materially from those anticipated in these forward-looking statements as a result of various factors, including those discussed in “Risk Factors” and in other parts of this Quarterly Report on Form 10-Q.

Current wording

The following information should be read in conjunction with the unaudited interim condensed consolidated financial statements and the notes thereto included in this Quarterly Report on Form 10-Q and the audited annual consolidated financial statements and the notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2024, which was filed with the SEC on March 13, 2025. Our actual results may differ materially from those anticipated in these forward-looking statements as a result of various factors, including those discussed in “Risk Factors” and in other parts of this Quarterly Report on Form 10-Q.

Previous wording

We are a biopharmaceutical company focused on the development and commercialization of innovative cardiovascular medicines. Our lead product candidate, etripamil, is a novel and potent calcium channel blocker that we designed as a rapid-onset nasal spray to be self-administered by patients. We are developing etripamil for the treatment of specific arrhythmias with a lead indication to treat paroxysmal supraventricular tachycardia, or “PSVT”, and an indication to treat atrial fibrillation with rapid ventricular rate, or “AFib-RVR”.

Current wording

We are a biopharmaceutical company focused on the development and commercialization of innovative cardiovascular medicines. Our objective is to commercialize and develop CARDAMYST (also known as etripamil) in the United States as a fast-acting, portable nasal spray treatment for use by patients anywhere, anytime an attack of supraventricular tachycardia, or “SVT” occurs. We are also developing etripamil for the indication of atrial fibrillation with rapid ventricular rate, or “AFib-RVR.”

Previous wording

We believe that PSVT is a large and under-recognized market that we estimate affects approximately two million Americans and results in over 150,000 emergency department visits and hospital admissions and up to 80,000 ablations per year. From this diagnosed population, we define the target addressable market for etripamil as 40 to 60% of patients who experience frequent and longer, moderate to severe episodes each year. After being exposed to the data from the RAPID clinical study in market research, Cardiologists reported a willingness to prescribe etripamil to approximately 50% of the patients with PSVT in their care, which suggests 500,000 to 800,000 patients can potentially be treated with etripamil in the peak year. Additionally, we believe that these target patients will use etripamil to treat a median of five episodes per year based on the projected number of longer or more intense episodes (self-reported) experienced by the patient. This implies potential demand in the US for etripamil of 2.5 million to 4 million episodes treated in the peak year.

Current wording

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.

Previous wording

Atrial fibrillation, or “AFib”, is a common form of 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 ventricular rate, or “AFib-RVR”, which is frequently defined as a heart rate ≥ 110 beats per minute. The occurrence of a RVR in patients with AFib 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, when faced with a sudden episode of AFib-RVR, acute rate control is needed, and most treatments are oral AV-nodal targeted drugs such as a beta blocker or calcium channel blockers. However, these oral rate control drugs, when used acutely, do not adequately provide immediate or adequate ventricular rate control due to a 30- to 90-minute delayed onset of action, and, as a result, many patients need faster 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 AFib. Similar to SVT, patients feel a loss of control by needing to visit the emergency department for overcoming their atrial fibrillation attack and the unpredictable nature of RVR episodes; doctors are frustrated by 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.

Current wording

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 adequate ventricular rate control due to a 30- to 90-minute delayed onset of action, and, as a result, many patients need faster 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

Previous wording

An estimated five million Americans suffer from AFib. The Centers for Disease Control projects the prevalence of AFib will grow to an estimated 12 million patients by 2030. A subset of AFib patients experience 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 emergency department to resolve symptoms. In 2016, nearly 800,000 patients were admitted to the emergency department due to AFib symptoms. Treatment for such symptoms typically includes medically supervised intravenous administration of calcium channel blockers or beta blockers, or electrical cardioversion. ​

Current wording

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 target addressable market of up to approximately four to five million patients by 2030 for etripamil in patients with AFib-RVR.

Previous wording

In April 2024, the Company announced new clinical data demonstrating real-world application of etripamil, an investigational new drug, for conversion of recurrent PSVT. Conducted in North and South America, an open label, Phase 3 study of etripamil in PSVT (the NODE-303 study) was presented at The American College of Cardiology Scientific Sessions. NODE-303 evaluated self-administered etripamil (70 mg, nasal spray) in an outpatient setting for up to four episodes of PSVT per patient. Other key characteristics of the NODE-303 study that distinguish the study from earlier phase 3 studies, include the removal of the in-office test dose as well as the use of a broader inclusion exclusion study entry criteria. For example, NODE-303 did not exclude patients with a history of co-morbid AFib or atrial flutter. The results demonstrated that symptom-prompted treatment with etripamil restored sinus rhythm with a median time-to-conversion of 17.0 minutes and was generally well tolerated. The conversion of PSVT to sinus rhythm was similar among multiple PSVT episodes and the frequency of treatment-emergent adverse events within 24 hours decreased with successive episodes. Adverse events were predominantly localized to the drug’s nasal administration site, consistent with prior trial findings. The protocol was amended during the trial to allow for a repeat dose of drug if symptoms persisted 10 minutes following the first dose, however the majority of the clinical trial was conducted prior to the amendment and utilized the 70 mg single dose. Efficacy of etripamil for PSVT conversion (restoration of sinus rhythm) in NODE-303 was 60% by 30 minutes after drug self-administration, and 69.9% by 60 minutes after drug self-administration; these rates of conversion are similar to those demonstrated in double-blinded and other open-label etripamil studies. This data supports a potentially significant shift in the management approach for recurrent PSVT.

Current wording

In April 2024, we announced new clinical data demonstrating real-world application of etripamil, an investigational new drug, for conversion of recurrent PSVT. Conducted in North and South America, an open label, Phase 3 study of etripamil in PSVT (the NODE-303 study) was presented at The American College of Cardiology Scientific Sessions. NODE-303 evaluated self-administered etripamil (70 mg, nasal spray) in an outpatient setting for up to four episodes of PSVT per patient. Other key characteristics of the NODE-303 study that distinguish the study from earlier Phase 3 studies, include the removal of the in-office test dose as well as the use of a broader inclusion exclusion study entry criteria. For example, NODE-303 did not exclude patients with a history of co-morbid AFib or atrial flutter. The results demonstrated that symptom-prompted treatment with etripamil restored sinus rhythm with a median time-to-conversion of 17 minutes and was generally well tolerated. The conversion of PSVT to sinus rhythm was similar among multiple episodes of PSVT and the frequency of treatment-emergent adverse events within 24 hours decreased with successively treated episodes. Adverse events, or “AEs,” were predominantly localized to the drug’s nasal administration site, consistent with prior trial findings. The protocol was amended during the trial to allow for a repeat dose of drug if symptoms persisted 10 minutes following the first dose, however most of the clinical trial was conducted prior to the amendment and used the 70 mg single dose. Efficacy of etripamil for PSVT conversion (restoration of sinus rhythm) in NODE-303 was 60.0% by 30 minutes after drug self-administration, and 69.9% by 60 minutes after drug self-administration; these rates of conversion are similar to those demonstrated in double-blinded and other open-label etripamil studies. This data supports a potentially significant shift in the management approach for recurrent PSVT.

Previous wording

In October 2022, we announced positive and statistically significant topline efficacy and safety data from our Phase 3 RAPID clinical trial evaluating etripamil in patients with PSVT. These results from the RAPID trial were presented in November 2022, as a Late-Breaking Clinical Trial at the American Heart Association Scientific Sessions (Chicago, IL). These results were also published inThe Lancet in July 2023. RAPID, a multi-center, randomized, double-blind, placebo-controlled, event-driven Phase 3 trial, enrolled 706 patients across clinical sites in North America and Europe. Patients were randomized 1:1 using a self-administered regimen consisting of a first dose of study drug, and a repeat dose 10 minutes later if symptoms persisted. Self-administration was prompted by a patient’s symptoms and performed in the at-home setting without medical supervision. The RAPID trial achieved its primary endpoint with etripamil demonstrating a highly statistically significant and clinically meaningful difference in time to SVT conversion as compared to placebo. A Kaplan Meier analysis demonstrated a significantly greater proportion of patients who took etripamil converted to sinus rhythm within thirty minutes compared to patients that took placebo (64.3% vs. 31.2%; hazard ratio, or “HR”, 2.62; 95% CI 1.66, 4.15; p<0.001). By 90 minutes post-study drug administration, 80.6% of patients taking etripamil converted to sinus rhythm compared to 60.7% of patients taking placebo (HR = 1.93; 95% CI 1.349, 2.752; p<0.001). Statistically significant reductions in time to conversion in patients who took etripamil were evident early and persisted throughout the observation window of the trial compared to patients that took placebo. The median time-to-conversion for patients in the RAPID trial who self-administered etripamil was 17.2 minutes compared to 53.3 minutes for patients taking placebo. The safety and tolerability data from the RAPID trial supports the potential self-administration of etripamil, with findings consistent with those observed in prior trials. The most common randomized-treatment emergent adverse events, or RTEAEs, and adverse events, or “AEs”, occurred within 24 hours of etripamil administration and were related to the nasal local administration site. Overall, the majority of RTEAEs were reported as mild (68%) or moderate (31%). No serious adverse effects related to etripamil were reported.

Current wording

In October 2022, we announced positive and statistically significant topline efficacy and safety data from the Phase 3 RAPID clinical trial of etripamil in patients with PSVT. These results were further presented shortly thereafter, in November 2022, as a Late-Breaking Clinical Trial Session at the American Heart Association Scientific Sessions 2022 (Chicago, IL) and subsequently published inThe Lancet (June 2023). RAPID, our multi-center, randomized, double-blind, placebo-controlled, event-driven Phase 3 trial, enrolled 706 patients across clinical sites in North America and Europe. Patients were randomized 1:1 to a regimen of self-administering a first dose etripamil nasal spray, with a repeat dose 10 minutes later if symptoms persisted, or a matching placebo regimen. Self-administration was prompted by a patient’s customary symptoms and was performed in the at-home setting without medical supervision. The RAPID trial achieved its primary endpoint, with patients taking the regimen with etripamil demonstrating a highly statistically significant and clinically meaningful difference in time to SVT conversion as compared to placebo. A Kaplan Meier analysis demonstrated a significantly greater proportion of patients who took etripamil converted within thirty minutes compared to placebo (64.3% vs. 31.2%; hazard ratio, or “HR,” 2.62; 95% CI 1.66, 4.15; p<0.001). By 90 minutes post-study drug administration, 80.6% of etripamil patients converted versus 60.7% of placebo patients (HR = 1.93; 95% CI 1.349, 2.752; p<0.001) and statistical significance was maintained throughout the 5-hour observation window. Statistically significant reductions in time to conversion in patients who took etripamil were evident early and persisted throughout the observation window of the study compared to placebo. The median time to conversion for patients in RAPID who self-administered etripamil was 17.2 minutes compared to 53.3 minutes for patients on placebo. The safety and tolerability data from the RAPID trial continues to support the potential self-administration use of etripamil, with findings consistent with those observed in prior trials. The most common randomized-treatment emergent adverse events, or “RTEAEs,” and AEs which occurred within 24 hours of administration of etripamil, were related to the nasal local administration site. Overall, the majority of RTEAEs were reported as mild (68%) or moderate (31%). There were no serious AEs related to etripamil.

Previous wording

The use of additional medical interventions and emergency department utilization were key secondary endpoints for both the RAPID and NODE-301 trials. In a pre-planned pooled analysis across both trials, patients who self-administered

Current wording

The use of additional medical interventions and visits to an emergency department were important secondary measures of efficacy for both the RAPID and NODE-301 studies, although with the understanding that neither study was individually powered to expect statistical differences. In a pre-planned analysis across both studies, patients who self-administered etripamil sought additional medical interventions 43% less frequently (15% vs. 25%; p=0.013) and had 39% fewer emergency department visits (14% vs. 22%; p=0.035) than patients in the placebo arm.

Previous wording

On September 6, 2024, our licensing partner, Corxel (formerly Ji Xing Pharmaceuticals Limited, JIXING), a clinical-stage biopharmaceutical company announced positive topline data from the Phase 3 JX02002 clinical trial of etripamil nasal spray in patients with PSVT in China.

Current wording

In September 2024, our licensing partner, Corxel (formerly Ji Xing Pharmaceuticals Limited, JIXING), a clinical-stage biopharmaceutical company announced positive topline data from the Phase 3 JX02002 clinical trial of etripamil nasal spray in patients with PSVT in China.

Previous wording

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 inCirculation: Arrhythmia and Electrophysiology. The randomized, placebo-controlled Phase 2 ReVeRA trial enrolled 87 patients and dosed 56 patients aged 18 years and older with AFib who experienced a ventricular rate of 110 or more beats per minute (bpm) prior to receiving etripamil nasal spray. The trial was designed to assess the reduction in ventricular rate (primary endpoint), the time to achieve maximum reduction in ventricular rate, duration of effect, and patient satisfaction with treatment using the Treatment Satisfaction Questionnaire 9 (TSQM-9) patient reported outcome (PRO) tool (key secondary endpoints).

Current wording

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 inCirculation: Arrhythmia and Electrophysiology. The randomized, double-blinded, placebo-controlled ReVeRA trial of etripamil nasal spray enrolled 87 patients and dosed 56 patients aged 18 years and older with AFib who urgently presented experiencing AFib and a ventricular rate of 110 or more beats per minute, or “bpm.” The trial was designed to assess the magnitude, rapidity, and duration of reduction and the patient satisfaction with treatment using an established patient reported outcome, or “PRO,” tool. Data showed that delivery of etripamil nasal spray (70 mg) significantly and rapidly reduced ventricular rate, in a pattern consistent with the drug’s pharmacologic profile. Etripamil achieved the primary endpoint with a high degree of statistical significance; patients experienced a ventricular rate reduction of 29.91 bpm (95% confidence interval: -40.31, -19.52; p<0.0001) in the etripamil arm relative to placebo. The absolute maximum reduction in rate in the etripamil arm was 34.97 bpm. Using the Treatment Satisfaction Questionnaire 9, or “TSQM-9,” PRO, compared to placebo, patients treated with etripamil demonstrated significant improvements in two satisfaction ratings: effectiveness (p<0.0001) and relief of symptoms (p=0.0002), with the degrees of improvement consistent with those customarily described as clinically meaningful. Treatment-emergent serious adverse events, or “TESAEs,” were rare and the most common (≥ 5%) adverse events were mild or moderate in intensity and included nasal discomfort, rhinorrhea, increased lacrimation, throat irritation and dizziness. Further trial details are below in this document.

Previous wording

In the first quarter of 2024, we met with the FDA in a Type C meeting. In this meeting, the FDA reiterated its prior guidance from our Pre-IND meeting regarding the availability of an 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 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 patient-reported outcomes measure, or “PRO”, and the application of a seven-point anchored scale was discussed with the FDA. We anticipate finalizing the Phase 3 study protocol in 2024 and anticipate enrolling patients in the first half of 2025.

Current wording

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 supplemental new drug application, or “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 the application of a seven-point anchored scale was discussed with the FDA. We have finalized the Phase 3 study protocol following FDA’s review and obtained concurrence with the FDA to proceed; however, we are delaying enrollment of the study due to the CRL received on the NDA for etripamil in PSVT.

Previous wording

We continue to engage with the FDA in finalizing the Phase 3 clinical study protocol for AFib-RVR. The study is expected to be conducted in the at-home setting consisting of patients with a history of symptomatic episodes and using a self-administered, repeat-dose regimen of 70mg per dose similar to what was studied in the RAPID trial in patients with PSVT. Our target population would be patients with verified AFib-RVR, and the ITT population would be all patients self-administering the study drug for perceived AFib-RVR. The primary endpoint being considered is the mean change from baseline ventricular rate to nadir ventricular rate for patients treated with etripamil vs placebo, as was studied in the ReVeRA trial. Our key secondary endpoint will be based on a PRO acceptable to the FDA, which is the same or similar to ones we have used in our PSVT and AFib-RVR programs. We estimate that the study size would be approximately 150 events from patients with a history of symptomatic episodes.

Current wording

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

Previous wording

Since inception, we have incurred significant operating losses. For the three months ended September 30, 2024 and 2023, we recorded net losses of $9.4 million and $15.1 million, respectively. For the nine months ended September 30, 2024 and 2023, we recorded net losses of $29.2 million and $46.1 million, respectively. As of September 30, 2024, we had an accumulated deficit of $355.2 million. We expect to continue to incur significant losses for the foreseeable future. We anticipate that a substantial portion of our capital resources and efforts in the foreseeable future will be focused on completing the necessary development activities required for obtaining regulatory approval and preparing for potential commercialization of our product candidates. We had $12.8 million of cash and cash equivalents and $63.6 million of short-term investments at September 30, 2024.

Current wording

Since inception, we have incurred significant operating losses. For the three months ended March 31, 2025 and 2024, we recorded net losses of $20.8 million and $10.4 million, respectively. As of March 31, 2025, we had an accumulated deficit of $388.3 million. We expect to continue to incur significant losses for the foreseeable future. We anticipate that a substantial portion of our capital resources and efforts in the foreseeable future will be focused on completing the necessary development activities required for obtaining regulatory approval and preparing for potential commercialization of our product candidates. We had $45.1 million of cash and cash equivalents and $10.9 million of short-term investments at March 31, 2025.

Previous wording

We expect to continue to incur significant expenses and to increase operating losses for at least the next several years. Our net losses may fluctuate significantly from period to period, depending on the timing of our planned clinical trials and expenditures on other research and development activities. We expect our expenses will increase over time as we:

Current wording

We expect to continue to incur significant expenses and increased operating losses for at least the next several years. Our net losses may fluctuate significantly from period to period, depending on the timing of our planned clinical trials and expenditures on other research and development activities. We expect our expenses will increase over time as we:

Previous wording

Inflation rates may also materially adversely affect our business and corresponding financial position and cash flows. Inflationary factors, changes to interest rates and overhead costs may adversely affect our operating results. Interest and inflation rates also present a recent challenge impacting the U.S. economy and could make it more difficult for us to obtain traditional financing on acceptable terms, if at all, in the future. Additionally, geopolitical events such as the Russia-Ukraine war and unrest and/or further escalation in Israel and Gaza, recent banking instabilities and other U.S. geopolitical

Current wording

Inflation rates may also materially adversely affect our business and corresponding financial position and cash flows. Inflationary factors, changes to interest rates and overhead costs may adversely affect our operating results. Interest and inflation rates also present a recent challenge impacting the U.S. economy and could make it more difficult for us to obtain traditional financing on acceptable terms, if at all, in the future. Additionally, geopolitical events such as the Russia-Ukraine war and unrest and/or further escalation in Israel and Gaza, banking instabilities, ongoing changes to U.S. and international tariffs and other trade restrictions and trade barriers, renegotiation of international trade agreements or further escalations of trade tensions, and other U.S. geopolitical issues affecting other territories and employee availability and wage increases, and economic markets all of which may result in additional stress on our working capital resources.

Previous wording

We have not generated any revenues from product sales to date. We would only expect to generate revenues from product sales in the near future if the FDA approves the NDA. We recorded no revenue for the three and nine months ended September 30, 2024. We recorded no revenue and $1.0 million in revenue during the three and nine months ended September 30, 2023, respectively. This revenue is due to a milestone reached as a result of the successful initiation of a Phase 1 Clinical Trial of the product by or on behalf of Corxel for the treatment of PSVT in the People’s Republic of China, or “the Territory”, including mainland China, Hong Kong Special Administrative Region, Macau Special Administrative Region and Taiwan.

Current wording

We have not generated any revenues from product sales to date. We would only expect to generate revenues from product sales if the FDA approves the NDA.

Previous wording

We recorded no revenue for the three and nine months ended September 30, 2024. We recorded no revenue and $1.0 million in revenue during the three and nine months ended September 30, 2023, respectively. This prior year revenue was the result of having reached a milestone pursuant to our License and Collaboration Agreement, dated May 15, 2021, with Corxel, formerly known as Ji Xing Pharmaceuticals Limited (such party “Ji Xing” and , such agreement, the “Ji Xing License Agreement”), due upon the successful initiation of a Phase 1 Clinical Trial of a pharmaceutical product that uses a device to deliver etripamil by nasal spray by or on behalf of Corxel for the treatment of PSVT in the People’s Republic of China, or “the Territory”, including mainland China, Hong Kong Special Administrative Region, Macau Special Administrative Region and Taiwan.

Current wording

We record license revenue when milestones are reached pursuant to our License and Collaboration Agreement, dated May 15, 2021, with Corxel Pharmaceuticals, or “Corxel,” formerly known as Ji Xing Pharmaceuticals Limited (such party “Ji Xing” and, such agreement, the “Ji Xing License Agreement”). During the three months ended March 31, 2025 and 2024, no milestones were achieved and no revenue was recorded under this agreement.

Previous wording

General and administrative expenses include personnel and related compensation costs, expenses for outside professional services, lease expense, insurance expense and other general administrative expenses. Personnel costs consist of salaries, bonuses, benefits, related payroll taxes and share-based compensation. Outside professional services consist of legal, accounting and audit services and other consulting fees.

Current wording

General and administrative expenses include personnel and related compensation costs, expenses for outside professional services, lease expense, insurance expense and other general administrative expenses. Personnel costs consist of salaries,

Previous wording

We expect to continue to incur expenses as a public company, including expenses related to compliance with the rules and regulations of the Securities and Exchange Commission, or “SEC”, and those of any national securities exchange on which our securities are traded, additional insurance expenses, investor relations activities, and other administrative and professional services.

Current wording

We expect to continue to incur expenses as a public company, including expenses related to compliance with the rules and regulations of the SEC, and those of any national securities exchange on which our securities are traded, additional insurance expenses, investor relations activities, and other administrative and professional services.

Previous wording

first, we want to leverage rigorous primary and secondary research to fully understand our target disease states from the perspective of the patient, healthcare provider, and payer; second, we want to understand and document the burden of disease posed by PSVT and AFib-RVR from an epidemiology, healthcare resource use, and cost perspective; and third, we want to engage our target patient, physician, and payer stakeholders with evidence-based and compliant educational materials that serve to increase the awareness and understanding of the impact of PSVT and AFib-RVR on patients and the overall healthcare system.

Current wording

Commercial expenses consist primarily of personnel and related compensation costs, market and health economic research, and market development activities for PSVT and, to a lesser extent, AFib-RVR. The focus of these expenses is three-fold: first, we want to leverage rigorous primary and secondary research to fully understand our target disease states from the perspective of the patient, healthcare provider, and payor; second, we want to understand and document the burden of disease posed by PSVT and AFib-RVR from an epidemiology, healthcare resource use, and cost perspective; and third, we want to engage our target patient, physician, and payor stakeholders with evidence-based and compliant educational materials that serve to increase the awareness and understanding of the impact of PSVT and AFib-RVR on patients and the overall healthcare system.

Previous wording

Interest income primarily consists of interest income from our cash equivalents and short-term investments.

Current wording

Interest income primarily consists of interest income from our cash and cash equivalents and short-term investments.

Previous wording

Comparison of the Three and Nine Months Ended September 30, 2024 and 2023

Current wording

Comparison of the Three Months Ended March 31, 2025 and 2024

Previous wording

The following table shows our research and development expenses by type of activity for the three and nine months ended September 30, 2024 and 2023, respectively.

Current wording

The following table shows our research and development expenses by type of activity for the three months ended March 31, 2025 and 2024, respectively.

Previous wording

General and administrative expenses decreased $0.5 million, or 11.5%, for the three months ended September 30, 2024, compared to the three months ended September 30, 2023, primarily due to a decrease in personnel costs, partially offset by an increase in outside service costs.

Current wording

General and administrative expenses increased by $1.2 million, or 30.7%, for the three months ended March 31, 2025 compared to the three months ended March 31, 2024. This increase was driven primarily by an increase in outside service costs, partially offset by a decrease in personnel costs.

Previous wording

We anticipate our commercial expenses will increase as we invest in the infrastructure, personnel and operational expenses required to launch our first product in the United States, if the FDA approves the NDA.

Current wording

If the FDA approves the NDA, we anticipate our commercial expenses will increase as we invest in the infrastructure, personnel and operational expenses required to launch our first product in the United States.

Previous wording

Interest income was $1.1 million and $1.1 million for the three months ended September 30, 2024 and 2023. Interest income was $3.3 million and $2.9 million for the nine months ended September 30, 2024 and 2023, respectively. The increase in interest income was due to a larger amount of assets invested in 2024 when compared to 2023.

Current wording

Interest income was $0.7 million and $1.0 million for the three months ended March 31, 2025 and 2024, respectively. The decrease in interest income was due to decreasing interest rates and less assets invested in 2025 when compared to 2024.

Previous wording

Commercial expenses decreased by $2.5 million, or 56.7%, for the three months ended September 30, 2024, compared to the same period in 2023. This decrease is a result of a decrease in personnel costs, professional costs and other operational expenses related to commercialization.

Current wording

Interest expense remained consistent for the three months ended March 31, 2025 compared to the same period in 2024.

Previous wording

We have incurred operating losses and experienced negative operating cash flows since our inception, and we anticipate continuing to incur losses for at least the next several years. As of September 30, 2024, we had cash, cash equivalents and short-term investments of $76.4 million and an accumulated deficit of $355.2 million.

Current wording

We have incurred operating losses and experienced negative operating cash flows since our inception, and we anticipate continuing to incur losses for at least the next several years. As of March 31, 2025, we had cash, cash equivalents and short-term investments of $56.0 million and an accumulated deficit of $388.3 million.

Previous wording

On July 29, 2020, we entered into an Open Market Sale Agreement SM, or the “Sales Agreement”, with Jefferies LLC with respect to an at-the-market offering program, or the “ATM Program”, under which the Company may issue and sell its common shares having an aggregate offering price of up to $50 million through Jefferies as its sales agent or principal. On May 31, 2023, we filed a prospectus supplement (File No. 333-261049) that amended and restated the information in our prospectus supplement dated July 29, 2020, and, accordingly, the information in this prospectus supplement superseded the information contained in that prospectus supplement, or the prior prospectus supplement. Pursuant to that prior prospectus supplement and accompanying base prospectus contained in our Registration Statement on Form S-3 (File No. 333-239318), or the prior prospectus, we issued 361,236 common shares under the Sales Agreement, resulting in net proceeds of $2.6 million (net of issuance costs of $0.1 million). No shares were sold under the Sales Agreement during the three or nine months ended September 30, 2024.

Current wording

On July 29, 2020, we entered into an Open Market Sale Agreement SM, or the “Original Sale Agreement,” with respect to an at-the-market offering program, or the “ATM Program,” under which the Company could issue and sell its common shares having an aggregate offering price of up to $50.0 million through Jefferies LLC, or “Jefferies,” as its sales. On March 18, 2025, we entered into an Amended and Restated Open Market Sale Agreement SM, or the “Amended Agreement,” with Jefferies. The Amended Agreement amends and restates, in its entirety, the Original Sale Agreement. Under the Amended Agreement, the Company may issue and sell its common shares, no par value per share, for an aggregate offering price of up to $77.8 million (which includes the approximately $2.8 million of sales previously made pursuant to the Original Sale Agreement through the date the Amended Agreement was entered into), or the “ATM Shares.” The ATM Shares will be sold pursuant to the Company’s shelf registration statement on Form S-3 (File No. 333-283162). We previously issued 361,236 common shares under the Original Sale Agreement, resulting in net proceeds of approximately $2.6 million (net of issuance costs of approximately $0.1 million). No common shares were sold under the Original Sale Agreement or the Amended Agreement during the three months ended March 31, 2025.

Previous wording

We expect that our operating plan, existing cash and cash equivalents and short-term investments will be sufficient to fund our operations for at least the next 12 months from the date of issuance of this Form 10-Q for the quarter ended September 30, 2024 and that there are no known events or conditions that may cast substantial doubt on our ability to continue as a going concern for at least the next 12 months from the date of this filing.

Current wording

We expect that our operating plan, existing cash and cash equivalents and short-term investments to be sufficient to fund our operations for at least the next 12 months from the date of issuance of this 10-Q for the quarter ending March 31, 2025 and that there are no events or conditions that may cast substantial doubt on our ability to continue as a going concern for at least the next 12 months from the date of this filing.

Previous wording

Pursuant to the Royalty Purchase Agreement, RTW agreed to purchase, following the FDA approval of etripamil (subject to certain conditions), in exchange for a purchase price of $75.0 million, the right to receive a tiered quarterly royalty payments, or “royalty interest”, on the annual net product sales of etripamil in the United States. This represents a contingent future source of funding, in order for the Company to receive the $75 million dollars, the closing conditions specified in the Royalty Purchase Agreement, which includes the Company receiving marketing approval from the FDA on or prior to September 30, 2025, must be met.

Current wording

payments, or “royalty interest,” on the annual net product sales of etripamil in the United States. This represents a contingent future source of funding, in order for the Company to receive the $75 million, the closing conditions specified in the Royalty Purchase Agreement, which includes the Company receiving marketing approval from the FDA on or prior to September 30, 2025, must be met.

Previous wording

to incur increasing operating losses for the foreseeable future as we continue the clinical development of our product candidate. At this time, due to the inherently unpredictable nature of clinical development, we cannot reasonably estimate the costs we will incur and the timelines that will be required to complete development, obtain marketing approval, and commercialize etripamil or any future product candidates, if at all. For the same reasons, we are also unable to predict when, if ever, we will generate revenue from product sales or whether, or when, if ever, we may achieve profitability. Clinical and preclinical development timelines, the probability of success, and development costs can differ materially from expectations.

Current wording

We use our cash primarily to fund research and development and pre-commercial expenditures. We expect our research and development expenses to continue commensurate with the development and commercialization of etripamil. We expect to continue to incur operating losses for the foreseeable future as we continue the clinical development of our product candidate. At this time, due to the inherently unpredictable nature of clinical development, we cannot reasonably estimate the costs we will incur and the timelines that will be required to complete development, obtain marketing approval, and commercialize etripamil or any future product candidates, if at all. For the same reasons, we are also unable to predict when, if ever, we will generate revenue from product sales or whether, or when, if ever, we may achieve profitability. Clinical and preclinical development timelines, the probability of success, and development costs can differ materially from expectations.

Previous wording

Net cash used in operating activities during the nine months ended September 30, 2024 was $22.0 million, which consisted primarily of a net loss of $29.2 million. The net loss was partially offset by a net cash increase of $0.4 million related to the change in assets and liabilities, non-cash charges of $4.3 million related to share based compensation, and non-cash interest charges of $2.4 million related to the convertible note.

Current wording

Net cash used in operating activities during the three months ended March 31, 2025 was $14.0 million, which consisted primarily of a net loss of $20.8, offset by a net cash increase of $4.6 million related to the change in assets and liabilities, non-cash charges of $1.4 million related to share-based compensation, and non-cash interest charges of $0.9 million related to the 2029 convertible note.

Previous wording

Net cash used in operating activities during the nine months ended September 30, 2023 was $36.6 million, which consisted primarily of a net loss of $46.0 million. The net loss was partially offset by a net cash increase of $0.1 million related to the change in assets and liabilities, non-cash charges of $7.7 million related to share based compensation and non-cash interest charges of $1.5 million related to the convertible note.

Current wording

Net cash used in operating activities during the three months ended March 31, 2024 was $8.9 million, which consisted primarily of a net loss of $10.4 million and a net cash decrease of $0.9 million related to the change in assets and liabilities. These decreases were offset by non-cash charges of $1.5 million related to share-based compensation and non-cash interest charges of $0.8 million related to the 2029 convertible note.

Previous wording

In the nine months ended September 30, 2024, we acquired $99.6 million of short-term investments, and we redeemed $88.5 million in short-term investments. In the nine months ended September 30, 2023, we acquired $95.8 million of short-term investments, and we redeemed $87.0 million in short-term investments.

Current wording

In the three months ended March 31, 2025, we acquired $0.9 million of short-term investments, and we redeemed $34.5 million in short-term investments. In the three months ended March 31, 2024 we acquired $52.5 million of short-term investments, and we redeemed $25.5 million in short-term investments.

Previous wording

In the nine months ended September 30, 2024, our financing activities provided cash proceeds of $32.1 million. These proceeds were primarily a result of the $31.9 million received from the issuance of common shares and pre-funded warrants, net of $2.6 million in issuance costs paid under the Underwriting Agreement.

Current wording

In the three months ended March 31, 2024, our financing activities provided cash proceeds of $32.3 million. These proceeds were primarily a result of the $32.2 million received from the issuance of common shares and pre-funded warrants, net of $2.3 million in issuance costs paid under the Underwriting Agreement.

Previous wording

During the nine months ended September 30, 2024, there were no material changes to our contractual obligations and commitments described under Management’s Discussion and Analysis of Financial Condition and Results of Operations in our Annual Report on Form 10-K, filed with the SEC on March 21, 2024.

Current wording

During the three months ended March 31, 2025, there were no material changes to our contractual obligations and commitments described under Management’s Discussion and Analysis of Financial Condition and Results of Operations in our Annual Report on Form 10-K, filed with the SEC on March 13, 2025.

Previous wording

with United States generally accepted accounting principles, or “U.S. GAAP”, and on a basis consistent with those accounting principles followed by us. The preparation of these consolidated financial statements requires our management to make judgments and estimates that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements, as well as the reported revenue generated, and expenses incurred during the reporting periods. Our estimates are based on our historical experience and on various other factors that we believe are reasonable under the circumstances, the results of which form the basis for making judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Significant estimates and judgments include, but are not limited to:

Current wording

Our management’s discussion and analysis of our financial condition and results of operations is based on our unaudited interim condensed consolidated financial statements as of March 31, 2025, which have been prepared in accordance with United States generally accepted accounting principles, or “U.S. GAAP,” and on a basis consistent with those accounting principles followed by us. The preparation of these consolidated financial statements requires our management to make judgments and estimates that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements, as well as the reported revenue generated, and expenses incurred during the reporting periods. Our estimates are based on our historical experience and on various other factors that we believe are reasonable under the circumstances, the results of which form the basis for making judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Significant estimates and judgments include, but are not limited to: