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WordReference Random House Unabridged Dictionary of American English © 2024al′pha block′er, [Pharm.]- Drugsany of various substances that interfere with the action of the alpha receptors.
Also, al′pha-block′er. Cf. beta blocker. al′pha-block′ing, adj. Collins Concise English Dictionary © HarperCollins Publishers:: alpha-blocker n - 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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