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] Verapamil is a non-dihydropyridine calcium channel blocker. It's used to treat high blood pressure, arrhythmias, and chest pain (or angina) in adults. Verapamil works by slowing your heart rate and relaxing your blood vessels. This medication is taken by mouth typically about 3 to 4 times per day. 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 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 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 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. 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 reduces clearance of caffeine and increases serum caffeine concentrations, presumably via inhibition of hepatic metabolism. May advise patients to limit or minimize the intake of. Verapamil is an oral medication used to treat high blood pressure. Learn who it’s for, how it works, its side effects, warnings, and more. Verapamil has substantial inhibitory effects on the cardiac conduction system and is considered a Vaughan Williams class IV antiarrhythmic agent. May reduce resting heart rate and produce sinus arrest or SA block in patients with SA node disease (e.g., sick sinus syndrome).