Calan SR, Generic Calan SR, Verapamil is in a class of drugs called calcium channel blockers.

Verapamil relaxes (widens) blood vessels (veins and arteries), which makes it easier for the heart to pump and reduces its workload.

Verapamil is used to treat hypertension (high blood pressure), to treat angina (chest pain), and to control some types of irregular heartbeats.