Correct Answer: A

Rationale: Spironolactone, a potassium-sparing diuretic, can lead to hyperkalemia due to its mechanism of action. Hyperkalemia, or elevated potassium levels, can result in serious cardiac complications and requires immediate medical attention. Therefore, the nurse should promptly report any signs or symptoms of hyperkalemia to prevent potential adverse outcomes in the patient.

Correct Answer: C

Rationale: Omeprazole should be administered in the morning on an empty stomach to maximize its effectiveness. This timing is important as omeprazole works best when taken before a meal to inhibit acid production by the stomach. Taking it on an empty stomach in the morning allows the medication to be absorbed efficiently and provides optimal therapeutic effects throughout the day.

Correct Answer: D

Rationale: Maraviroc, used to treat HIV infection, can lead to severe allergic reactions, including hepatotoxicity. Monitoring for signs of liver damage, such as jaundice or right upper quadrant pain, is crucial for early detection and intervention.

Correct Answer: C

Rationale: Vitamin K is the antidote for Warfarin toxicity as it helps reverse the anticoagulant effects of Warfarin. Warfarin works by inhibiting vitamin K-dependent clotting factors, and administering vitamin K can replenish these factors, thereby counteracting the anticoagulant effects of Warfarin.

Correct Answer: A

Rationale: Amphotericin B is known to cause nephrotoxicity, a potential adverse effect that can be monitored by checking the client's serum creatinine levels. Regular monitoring of serum creatinine helps in early identification of kidney damage and allows for timely intervention to prevent further complications.