A person taking tricyclic antidepressants presents with blurred vision and dry mouth. These adverse effects result due to blockade of:: (A) M3 muscarinic receptors, (B) GABAA receptors, (C) H1 histamine receptors, (D) 5HT2 receptors
Answer is A. Ans. (A) M3 muscarinic receptors(Ref: KDT 8/e p486)Anticholinergic adverse effects of TCAs include dry mouth, constipation, blurring of vision, urinary retention, etc.