Correct Answer: A

Rationale: The nurse should instruct the client to report dyspnea because it can indicate pulmonary toxicity, a serious adverse effect of trastuzumab. Monitoring and early reporting of respiratory symptoms like dyspnea are essential to prevent further complications and ensure timely intervention.

Correct Answer: D

Rationale: Metformin can lead to lactic acidosis, especially in individuals with impaired renal function. Monitoring the client's serum creatinine levels is crucial to assess kidney function because Metformin is eliminated by the kidneys, and impaired renal function can increase the risk of adverse effects.

Correct Answer: C

Rationale: The correct answer is C: Sedation. Dextromethorphan can cause sedation, so the client should be advised to avoid activities that require alertness. Diarrhea, anxiety, and palpitations are not commonly associated adverse effects of Dextromethorphan.

Correct Answer: C

Rationale: The correct answer is C: Sedation. Dextromethorphan can lead to sedation as an adverse effect. The nurse should advise the client to avoid activities that require alertness when taking this medication to prevent any potential harm. Monitoring for sedation is crucial to ensure the client's safety and well-being.

Correct Answer: A

Rationale: Nausea, along with vomiting, visual disturbances, and confusion, can be early signs of Digoxin toxicity. The healthcare provider should closely monitor the client for these symptoms to prevent serious complications.