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A drug that blocks or counteracts the effects of epinephrine and other molecules that stimulate alpha-receptors, leading to various physiological reactions such as vasodilation and a decrease in blood pressure. Also called alpha-adrenergic antagonist, alpha-adrenergic blocker.
(Pharmacology) 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
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|Noun||1.||alpha-blocker - any of various drugs that block alpha-adrenergic receptors; used in treating benign prostatic hyperplasia; relaxes the muscles of the prostate and bladder|