Correct Answer: B

Rationale: The nurse should obtain the blood sample for the peak serum level at 1030. This timing allows for 30 minutes to elapse after the completion of the 1-hour IV infusion, which is the recommended window for obtaining the peak serum level of gentamicin.

Correct Answer: B

Rationale: When administering a Serotonin Antagonist, monitoring mental status changes is crucial. Serotonin Antagonists can affect neurological function, potentially leading to alterations in mental status. It is essential to assess for any changes in behavior, mood, or cognition to ensure patient safety and prompt intervention if needed.

Correct Answer: A

Rationale: The correct answer is Warfarin. Warfarin is an anticoagulant medication that helps prevent thromboembolic events by inhibiting the formation of blood clots. It is commonly used to reduce the risk of strokes or heart attacks in patients at risk for thrombosis.

Correct Answer: C

Rationale: Verifying the client's current cumulative lifetime dose of doxorubicin is necessary because excessive amounts of the medication can lead to cardiomyopathy, a serious and potentially life-threatening side effect. By monitoring the cumulative dose, healthcare providers can help prevent cardiotoxicity and ensure patient safety during treatment.

Correct Answer: C

Rationale: The correct instruction for a client taking Methotrexate is to avoid alcohol, as it can increase the risk of liver damage. Alcohol consumption should be avoided to prevent potential adverse effects while on this medication.