Milestone Pharmaceuticals, Inc. is a clinical-stage biopharmaceutical company. The Company is focused on developing and commercializing etripamil for the treatment of cardiovascular indications. Etripamil is its short-acting calcium channel blocker. It is developing Etripamil as a nasal spray to be administered by the patient to terminate episodes of paroxysmal supraventricular tachycardia (PSVT), as they occur. It is also focused on developing treatments for other indications, such as Atrial Fibrillation and Angina. Etripamil is in Phase-III development for PSVT.