Which of the following is not the adverse effect of clomipramine?
**Core Concept**
Clomipramine is a tricyclic antidepressant (TCA) with significant anticholinergic and antihistaminic properties. Its adverse effects are mainly due to its blockade of muscarinic and histaminic receptors, as well as its inhibition of the reuptake of norepinephrine and serotonin.
**Why the Correct Answer is Right**
Clomipramine's adverse effects include dry mouth (due to anticholinergic blockade), sedation (due to antihistaminic blockade), constipation, urinary retention, and orthostatic hypotension. Its blockade of muscarinic receptors also leads to blurred vision, tachycardia, and confusion. However, one notable effect of clomipramine is its potential to cause _weight gain_, which is a common side effect of TCAs. This is due to increased appetite and water retention.
**Why Each Wrong Option is Incorrect**
* **Option A:** Not a known adverse effect of clomipramine.
* **Option B:** Clomipramine can cause orthostatic hypotension due to its anticholinergic effects.
* **Option D:** Clomipramine can cause sedation due to its antihistaminic blockade.
**Clinical Pearl / High-Yield Fact**
TCAs like clomipramine have a narrow therapeutic index and can be hazardous in overdose. They should be used with caution in patients with cardiovascular disease and those taking other medications that can interact with them.
**Correct Answer: A.**