Correct Answer: C

Rationale: The correct answer is Acetaminophen. Acetaminophen, especially in high doses, can increase the risk of bleeding in clients taking warfarin. It is important to monitor for signs of bleeding when these medications are used concurrently to prevent adverse effects.

Correct Answer: D

Rationale: Prednisone is a corticosteroid that can cause hyperglycemia. The nurse should monitor the client's serum glucose levels closely to assess for elevated blood sugar levels.

Correct Answer: B

Rationale: Furosemide is a diuretic that commonly causes hyponatremia (low sodium levels) due to its effect on sodium and water excretion. The nurse must closely monitor the client for signs of hyponatremia, such as weakness, confusion, and muscle cramps, and promptly intervene to prevent complications.

Correct Answer: C

Rationale: Methylnaltrexone is an opioid antagonist used to treat severe constipation unrelieved by laxatives in opioid-dependent clients. It blocks the mu opioid receptors in the GI tract, helping to alleviate constipation without affecting pain relief or causing withdrawal symptoms.

Correct Answer: B

Rationale: Coarse tremors are a common sign of Lithium toxicity. It is important for healthcare providers to monitor for this symptom as it indicates a potential overdose of the medication. Severe hypertension, constipation, and muscle spasms are not typically associated with Lithium toxicity.