Moderate

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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