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Calcium channel blockers are medicines used to lower blood pressure. They stop calcium from entering the cells of the heart and arteries. Calcium makes the heart and arteries squeeze more strongly. By blocking calcium, calcium channel blockers allow blood vessels to relax and open.

Some calcium channel blockers also can slow the heart rate. This also can lower blood pressure. The medicines may be given to relieve chest pain, called angina. They also can help control an irregular heartbeat.

Calcium channel blockers are sometimes called calcium antagonists.