SINCE 1828
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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