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alpha blocker

or alpha-blocker

noun, Pharmacology.
any of various substances that interfere with the action of the alpha receptors.
Compare beta blocker.
Related forms
alpha-blocking, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for alpha-blocker


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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Contemporary definitions for alpha-blocker

any of various drugs that prevent the stimulation of alpha-adrenergic receptors that increase blood pressure

Usage Note

medicine's 21st Century Lexicon
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alpha-blocker in Medicine

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
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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