any of a class of drugs that block the flow of the electrolyte calcium (either in nerve cell conduction or smooth muscle contraction); can be used in the treatment of angina or arrhythmia or hypertension or migraine
any of a class of drugs that block the flow of the electrolyte calcium (either in nerve cell conduction or smooth muscle contraction of the heart); has been used in the treatment of angina or arrhythmia or hypertension or migraine
