variants
or H2 receptor antagonist
also H2 blocker
: 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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“H2 antagonist.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/H2%20antagonist. Accessed 30 Jul. 2025.
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