Medical Dictionary

H2 antagonist

noun \ -ˈtü- \
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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