alpha blocker

noun Pharmacology.
any of various substances that interfere with the action of the alpha receptors.
Also, alpha-blocker.
Compare beta blocker.

alpha-blocking, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
any of a class of drugs that prevent the stimulation of alpha adrenoceptors, a type of receptor in the sympathetic nervous system, by adrenaline and noradrenaline and that therefore cause widening of blood vessels: used in the treatment of high blood pressure and prostatic hyperplasia

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

alpha-blocker al·pha-block·er (āl'fə-blŏk'ər)
A drug that opposes the excitatory effects of norepinephrine released from sympathetic nerve endings at alpha receptors and causes vasodilation and a decrease in blood pressure. Also called alpha-adrenergic blocking agent.

The American Heritage® Stedman's Medical Dictionary
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