alpha blocker

or al·pha-block·er

noun Pharmacology.

any of various substances that interfere with the action of the alpha receptors.

Nearby words

  1. alpes-maritimes,
  2. alpestrine,
  3. alpha,
  4. alpha and omega,
  5. alpha angle,
  6. alpha brass,
  7. alpha carotene,
  8. alpha cell,
  9. alpha centauri,
  10. alpha centauri system

Compare beta blocker.

Related formsal·pha-block·ing, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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

Medicine definitions for alpha-blocker



A drug that opposes the excitatory effects of norepinephrine released from sympathetic nerve endings at alpha-adrenergic receptors and causes vasodilation and a decrease in blood pressure.alpha-adrenergic blocking agent

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.