This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other topics and Adverse effects, Subject name: Anatomy
After staing your patient on imipramine, his hea rate rises to 120/min and he has blurred vision. These effects can be explained by the fact imipramine: 
Select and explain. 
A. Is a muscarinic antagonist, B. Potentiates epinephrine, C. Is a ganglionic blocker, D. Is a potent a-adrenergic blocker
A: Is a muscarinic antagonist
Answer: A: Is a muscarinic antagonist 
Explanation: (Ref: KDT 6/e p444) These symptoms are of anticholinergic drugs. Tricyclic antidepressants have powerful anticholinergic propeies and can lead to these symptoms.