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Calcium Channel Blockers
Calcium channel blockers are used to treat heart rhythm disturbances, high blood pressure, and angina, but they can make heart failure worse. So your doctor may want you to avoid them. However, there are certain circumstances where he or she may prescribe a calcium channel blocker for one of the indications listed above and carefully monitor you for side effects.
Calcium channel blockers are available only by prescription and include amlodipine, diltiazem, nifedipine, verapamil, and a number of others.