H2 antagonist

noun
\ -ˈtü- How to pronounce H{inf}2{/inf} antagonist (audio) \
variants: or H2 receptor antagonist also H2 blocker

Medical Definition of H2 antagonist

: a drug (as cimetidine, famotidine, nizatidine, or ranitidine) that reduces or inhibits the secretion of gastric acid by binding competitively with histamine to H2 receptors on cell membranes

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