A nurse is collecting data from a client who reports nausea and has vomited clear emesis. Which of the following medications should the nurse administer?

A. Meperidine. Meperidine is an opioid analgesic used for moderate to severe pain. It does not treat nausea and vomiting and can worsen these symptoms by delaying gastric emptying. Opioids also depress the central nervous system, which may cause dizziness and sedation. B. Diazepam. Diazepam is a benzodiazepine used for anxiety, muscle spasms, and seizures. It has no antiemetic effects and does not relieve nausea or vomiting. Instead, it can cause dizziness and drowsiness, which may further discomfort the client. C. Naloxone. Naloxone is an opioid antagonist used to reverse opioid-induced respiratory depression. Since the client’s nausea is not opioid-related, naloxone would not be beneficial. Its administration can also cause withdrawal symptoms in opioid-dependent clients. D. Promethazine. Promethazine is an antiemetic that blocks histamine and dopamine receptors in the brain, reducing nausea and vomiting. It is commonly used for motion sickness, post-surgical nausea, and gastrointestinal illnesses, making it the appropriate choice for this client.