Correct Answer: D

Rationale: Dexamethasone is not used to treat Wilson's disease. It is a corticosteroid primarily used for conditions like inflammation, asthma, and Addison's disease. Wilson's disease is a genetic disorder involving copper accumulation and is treated with medications like chelating agents or zinc salts, not Dexamethasone.

Correct Answer: D

Rationale: Drugs ending in -tidine are histamine (H2) receptor antagonists, which block the action of histamine at the H2 receptors, commonly used to reduce stomach acid production. Therefore, the correct answer is an 'H antagonist.' It is essential to be familiar with drug suffixes as they can provide clues to the drug's class and function.

Correct Answer: A

Rationale: Quinidine is classified as a class IA sodium channel blocker. Class IA antiarrhythmics, like quinidine, work by blocking sodium channels and delaying repolarization. Propafenone, mentioned in the original rationale, is actually a class IC antiarrhythmic agent, not a class IA sodium channel blocker.

Correct Answer: A

Rationale: The correct answer is A. Clonidine, a Sympathoplegic, typically causes hypotension rather than hypertension. The other side effects associated with Clonidine include dry oral cavity, lethargic behavior, and difficulty breathing, making them incorrect choices in this context.

Correct Answer: D

Rationale: Ibuprofen is known to cause adverse effects such as nausea, renal dysfunction, and anemia. However, muscle wasting is not a common toxicity associated with Ibuprofen use. Therefore, the correct answer is D.