Side effect of antihistaminic is_______________?
Correct answer: C. Drowsiness
- A. Cough
- B. Headache
- C. Drowsiness
- D. Vertigo
Explanation
Many antihistamines, especially first-generation H1 blockers, cross the blood-brain barrier and commonly cause drowsiness. Cough and headache are not the characteristic class effect tested here.
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