Calan SR , medically known as verapamil, is a calcium channel blocking agent that is used to treat high blood pressure and angina .
It works by preventing the transportation of calcium into the heart cells and blood vessels, so that blood vessels relax and oxygen runs through the heart smoothly. Calan SR is available as oral tablets, extended-release capsules and injections.
Common side effects of Calan SR include light headache, dizziness, drowsiness, increased appetite, fatigue, constipation, nausea and weight gain.
Calan SR may also be used for treatment of other medical conditions, as suggested by your doctor.