Which medication is an H2 receptor blocker?

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Multiple Choice

Which medication is an H2 receptor blocker?

Explanation:
H2 receptor blockers decrease stomach acid by blocking histamine at the H2 receptors on parietal cells, which reduces acid production. Famotidine fits this mechanism, so it is the correct choice. Omeprazole and lansoprazole are proton pump inhibitors; they inhibit the hydrogen-potassium ATPase (the proton pump) to stop acid secretion at a different step. Rifaximin is an antibiotic, not involved in acid regulation.

H2 receptor blockers decrease stomach acid by blocking histamine at the H2 receptors on parietal cells, which reduces acid production. Famotidine fits this mechanism, so it is the correct choice.

Omeprazole and lansoprazole are proton pump inhibitors; they inhibit the hydrogen-potassium ATPase (the proton pump) to stop acid secretion at a different step. Rifaximin is an antibiotic, not involved in acid regulation.

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