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Which of the following drugs are H2 antihistamine?

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Which of the following drugs are H2 antihistamine?

(a) Cimetidine

(b) Omeprazole

(c) Pirenzepine

(d) Misoprostol

This question was posed to me during an interview.

This question is from Pharmacotherapy of Peptic Ulcer in chapter Histamine, Bradykinin and their Antagonists, Pharmacotherapy of Gastric Ulcer, Peptic Ulcer of Drug Biotechnology

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The correct answer is (a) Cimetidine

Explanation: H2 receptor blockage antihistamine function by reducing gastric acid secretion. H2 antihistamines are cimetidine, ranitidine, famotidine. Proton pump inhibitor will be omeprazole. Anticholinergics are Pirenzepine and prostaglandin analogues are misoprostol. Neutralization of gastric acid by antacids are by sodium carbonate.

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