Verapamil is used alone or together with other medicines to treat heart rhythm problems, severe chest pain (angina), or high blood pressure (hypertension). High blood pressure adds to the workload of the heart and arteries. Verapamil is used to treat high blood pressure and to control angina (chest pain). The immediate-release tablets are also used alone or with other medications to prevent and treat irregular heartbeats. Verapamil is in a class of medications called calcium-channel blockers. Verapamil is used to treat hypertension (high blood pressure), angina (chest pain), and certain heart rhythm disorders. The immediate-release tablets are also used alone or with other medications to prevent and treat irregular heartbeats. Verapamil is indicated to treat hypertension and other conditions related to heart disease. Learn about side effects, drug interactions, dosages, warnings, and more. Find patient medical information for Verapamil (Calan, Verelan, others) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Verapamil is a calcium channel blocker that widens your blood vessels and relaxes your heart muscle. This improves blood flow to your heart and helps it pump more easily. Verapamil, sold under various trade names, [1] is a calcium channel blocker medication used for the treatment of high blood pressure, angina (chest pain from not enough blood flow to the heart), and supraventricular tachycardia. [9].