Anti-epileptic, chemically derived from the tricyclic antidepressant is

Correct Answer: A

Rationale: Carbamazepine is a tricyclic antidepressant derivative that is commonly used in the treatment of epilepsy especially for focal and generalized tonic-clonic seizures.

Correct Answer: B

Rationale: Morphine stimulates the Edinger-Westphal nucleus, causing pupillary constriction (miosis).

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: B

Rationale: LSD exerts its hallucinogenic effects through serotonin (5-HT) receptor modulation.

Correct Answer: C

Rationale: Carbimazole treats hyperthyroidism (choice A), Levothyroxine hypothyroidism (choice B), and Propylthiouracil is pregnancy-safe (choice D), all correct. Methimazole (choice C) isn't metabolized into carbimazole; carbimazole is a prodrug for methimazole, the active form, making this wrong. This clarifies thionamide metabolism, key for therapeutic accuracy.