Which of the following histamine blockers has no effect on muscarinic receptors______________?
Correct answer: C. Terfenadine
- A. Diphenydramine
- B. Promethazine
- C. Terfenadine
- D. Pyrilamine
Explanation
Terfenadine is a second-generation H1 blocker with minimal penetration into the brain and negligible antimuscarinic activity. Diphenhydramine, promethazine, and pyrilamine are first-generation agents whose anticholinergic effects can cause dry mouth and blurred vision.
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