Definition

Calcium channel blockers are medicines that slow the movement of calcium into the cells of the heart and blood vessels. This, in turn, relaxes blood vessels, increases the supply of oxygen-rich blood to the heart, and reduces the heart's workload.

Purpose

Calcium channel blockers are used to treat high blood pressure, to correct abnormal heart rhythms, and to relieve the type of chest pain called angina pectoris. Physicians also prescribe calcium channel blockers to treat panic attacks and bipolar disorder (manic depressive illness) and to prevent migraine headache.

Precautions

Seeing a physician regularly while...