Patient on typical antipychotic develops restlessness typically of the lower limbs. Drug to treat this side effect is-
## **Core Concept**
The question tests understanding of extrapyramidal side effects (EPS) associated with typical antipsychotic medications, specifically **akathisia**, which is characterized by subjective feelings of restlessness and an urge to move, often manifesting as foot tapping, hand fidgeting, or leg crossing.
## **Why the Correct Answer is Right**
Akathisia is a form of EPS commonly caused by typical antipsychotics due to their potent **dopamine D2 receptor antagonism** in the striatum. The correct treatment involves either reducing the dose of the antipsychotic or adding a medication that can alleviate this side effect. **Propranolol**, a beta-blocker, is often used to treat akathisia. It is thought to work by reducing peripheral symptoms of anxiety or by modulating dopaminergic activity indirectly.
## **Why Each Wrong Option is Incorrect**
- **Option A:** While **benzatropine** is an anticholinergic used to treat EPS, it is more effective against parkinsonian symptoms (e.g., tremors, rigidity) rather than akathisia.
- **Option B:** **Vitamin B complex** does not have a direct role in treating akathisia or other EPS.
- **Option D:** **Clonazepam**, a benzodiazepine, can be used for a variety of conditions including anxiety and some types of EPS, but it is not the first-line treatment for akathisia.
## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that akathisia can sometimes be mistaken for **agitation** or **anxiety**, leading to inappropriate treatment with increased antipsychotic dosing or addition of anxiolytics, which can worsen the condition. Recognizing the subjective experience of restlessness and the objective signs is crucial.
## **Correct Answer:** . Propranolol