Which of the following is useful in treatment of trigeminal neuralgia:

Correct Answer: D

Rationale: Carbamazepine (choice D), an anticonvulsant, treats trigeminal neuralgia by stabilizing sodium channels, reducing nerve firing. Phenylbutazone (choice A), an NSAID, and Morphine (choice B), an opioid, aren't first-line. Atropine (choice C), an anticholinergic, is irrelevant. Carbamazepine is the standard therapy.

Correct Answer: D

Rationale: N-acetylcysteine restores glutathione levels, preventing hepatotoxicity from toxic paracetamol metabolites.

Correct Answer: B

Rationale: Darifenacin, a muscarinic receptor antagonist used for urinary tract infections, may enhance the action of vecuronium by reducing the risk of cholinergic side effects, such as bradycardia or bronchoconstriction, associated with muscle relaxants. Gentamicin, Timolol, Latanoprost, and Lovastatin are unlikely to have a significant impact on the action of vecuronium in this context.

Correct Answer: B

Rationale: Aripiprazole is an antipsychotic medication that is commonly used to treat symptoms of Tourette syndrome, which includes tics like head jerking, blinking, and grimacing. Fluoxetine, clonazepam, naltrexone, and imipramine are not typically used for treating tics associated with Tourette syndrome.

Correct Answer: D

Rationale: MAO inhibitors can increase dopamine levels excessively when combined with levodopa, leading to hypertensive crises.