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Which of the following drugs is NOT used as an antacid?

1. Phenelzine
2. Ranitidine
3. Aluminium hydroxide
4. Cimetidine

Correct answer: Phenelzine

Solution

Ranitidine and cimetidine reduce gastric acid (H2 blockers), and aluminium hydroxide neutralizes acid. Phenelzine is an MAO-inhibitor antidepressant, not an antacid.

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