Pharmacology · single question
Ranitidine works by:
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Correct answer: A. H2 receptor antagonism
Ranitidine (and famotidine, cimetidine) block H2 receptors on gastric parietal cells, reducing gastric acid secretion. H1 blockers (diphenhydramine, loratadine) are antihistamines used for allergy. Proton pump inhibitors (omeprazole) irreversibly inhibit the HÔü║/KÔü║ ATPase.