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Antihistamine drugs function as which of the following?

1. Antiallergic and analgesic
2. Antacid and antiallergic
3. Analgesic and antacid
4. Antiallergic and antidepressant

Correct answer: Antacid and antiallergic

Solution

Antihistamines act as both antiallergic agents (H1-blockers like diphenhydramine) and antacids (H2-blockers like ranitidine/cimetidine reduce stomach acid).

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