People's Pharmacy

Calan Sr

Generic Name:verapamil (slow release)

Revised:4/1/2000

Table of Contents

Side Effects and Interactions

One of the most common side effects of Calan is constipation. Although bothersome, this can often be controlled with fluid and fiber or a bulk-forming laxative such as psyllium.

Another reaction to be alert for is low blood pressure, which may show up as lightheadedness and dizziness.

Although uncommon, other adverse reactions include headache, fluid retention leading to swelling of arm and legs, nausea, tiredness, rash and slowed heart rate. Report any symptoms or suspected side effects to your physician promptly.

Calan can interact with a number of other drugs, including several that are used to treat high blood pressure or heart conditions, the asthma medicine theophylline, the anticonvulsant Tegretol, the transplant medication Sandimmune and the anti-tuberculosis agent rifampin.

The popular antidepressant Prozac may increase the likelihood of side effects from Calan.

Over-the-counter calcium supplements can reduce the effectiveness of Calan. Check with your doctor and pharmacist to make sure Calan is safe in combination with any other drugs you take.