any of a group of drugs that prevent the influx of calcium into excitable tissues such as smooth muscle of the heart or arterioles, used in the treatment of angina, hypertension, and certain arrhythmias.
Main Entry: calcium channel blocker Function: noun : any of a class of drugs (as verapamil) that prevent or slow the influx of calcium ions into smooth muscle cellsespecially of the heart and that are used especially to treat some forms of angina pectoris and some cardiac arrhythmias called also calcium blocker
