Correct Answer: A

Rationale: The correct instruction for a client prescribed allopurinol is to drink 2 liters of water daily. This helps reduce the risk of kidney stones, a potential side effect of allopurinol use. Adequate hydration is essential to prevent kidney stone formation and maintain kidney function while taking this medication.

Correct Answer: B

Rationale: When administering transdermal Methylphenidate, it is important to leave the patch on for 9 hours each day to ensure the medication is effective. This duration allows for proper absorption of the medication through the skin. It is crucial for parents to follow this instruction to achieve the desired therapeutic effect for their child.

Correct Answer: C

Rationale: Atenolol is a beta-blocker that can cause bradycardia as an adverse effect due to its mechanism of action in slowing down the heart rate. The nurse should instruct the client to monitor their pulse regularly and report any significant decreases to prevent complications related to bradycardia.

Correct Answer: A

Rationale: Etoposide, a chemotherapeutic agent, commonly causes hypotension as an adverse effect. It is crucial for the nurse to monitor the client for signs of hypotension, such as dizziness, lightheadedness, or a drop in blood pressure, to promptly intervene and prevent complications.

Correct Answer: B

Rationale: When a client is prescribed Lithium, monitoring serum lithium levels is crucial to ensure they remain within the therapeutic range and to assess for potential toxicity. Monitoring serum lithium levels helps prevent adverse effects associated with lithium toxicity, such as nausea, vomiting, diarrhea, tremors, and confusion.