The following adverse effect of corticosteroids is due to their mineralocorticoid action

Correct Answer: B

Rationale: Corticosteroids can cause sodium retention, leading to hypertension due to their mineralocorticoid effects.

Correct Answer: C

Rationale: Lithium reaches its peak serum levels typically within 2 to 4 hours after oral administration.

Correct Answer: B

Rationale: In this case, the neurologist decided to add a second-generation antiepileptic drug that blocks voltage-gated Na+ and Ca2+ channels and may inhibit the synaptic release of glutamate. Among the choices, Lamotrigine fits this description as it is known to block voltage-gated sodium channels, making it the most likely drug prescribed for the patient.

Correct Answer: C

Rationale: The correct answer is C: Cyclobenzaprine. Cyclobenzaprine is a centrally acting muscle relaxant commonly used to treat muscle spasticity in conditions like multiple sclerosis. It works by inhibiting nerve impulses to reduce muscle spasms. Neostigmine (A) is a cholinesterase inhibitor used for myasthenia gravis, not spasticity. Ropinirole (B) is a dopamine agonist used for Parkinson's disease and restless legs syndrome, not spasticity. Pyridostigmine (D) is also a cholinesterase inhibitor used for myasthenia gravis, not spasticity.

Correct Answer: D

Rationale: Buspirone (choice A), Alprazolam (choice B), and Baclofen (choice C) are correctly paired (anxiolytic, some antidepressant effect, less sedative muscle relaxant). Oxazepam (choice D), a benzodiazepine, isn't a TCA, making it the incorrect pair. This tests drug classification.