Alpha-blocker definition

ălfə-blŏkər
A drug that opposes the excitatory effects of norepinephrine released from sympathetic nerve endings at alpha-receptors and that causes vasodilation and a decrease in blood pressure.
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Any of a class of drugs used to dilate the blood vessels by blocking the nerve impulses that normally excite the alpha receptors.
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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.
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(pharmacology) A drug which blocks α1-adrenergic receptors in arteries and smooth muscles. Used to treat benign prostatic hyperplasia and prostatitis and other conditions.
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Other Word Forms

Noun

Singular:
alpha-blocker
Plural:
alpha-blockers