beta-blocker

be·ta-block·er   (bā'tə-blŏk'ər, bē'-)    n.  A drug, such as propanolol, that opposes the excitatory effects of norepinephrine released from sympathetic nerve endings at beta-receptors and is used for the treatment of angina, hypertension, arrhythmia, and migraine. Also called beta-adrenergic blocking agent.

Main Entry: be·ta–block·er
Pronunciation: -'bläk-&r
Function: noun
: any of a group of drugs (as propranolol) that combine withand block the activity of a beta-receptor to decrease the heart rate and force of contractions and lower high blood pressure and that are used especially to treat hypertension, angina pectoris, andventricular and supraventricular arrhythmias—compare ALPHA-BLOCKER

beta-blocker n.
A drug that opposes the excitatory effects of norepinephrine released from sympathetic nerve endings at beta-adrenergic receptors and is used for the treatment of angina, hypertension, arrhythmia, and migraine. Also called beta-adrenergic blocking agent.

beta-blocker   (bā'tə-blŏk'ər)  Pronunciation Key  A drug that blocks the excitatory effects of epinephrine on the cardiovascular system by binding to cell-surface receptors (called beta-receptors). Beta-blockers are used to treat high blood pressure, angina, and certain abnormal heart rhythms.