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?

Choice A rationale Promethazine is an antiemetic that acts as a dopamine receptor antagonist, blocking dopamine at the chemoreceptor trigger zone (CTZ) in the brain. This action helps to reduce nausea and vomiting by preventing the activation of the vomiting reflex. It also has antihistamine and anticholinergic properties. Choice B rationale Naloxone is an opioid antagonist primarily used to reverse opioid overdose by competitively binding to opioid receptors, thereby blocking the effects of opioid medications. It is not indicated for the treatment of nausea and vomiting. Choice C rationale Meperidine is an opioid analgesic used for pain management. While opioids can sometimes cause nausea as a side effect, meperidine itself is not indicated for the treatment of nausea and vomiting; rather, it can induce it. Choice D rationale Diazepam is a benzodiazepine primarily used as an anxiolytic, sedative, muscle relaxant, and anticonvulsant. While it can reduce anxiety which may contribute to nausea, its primary mechanism of action is not antiemetic, and it is not a first-line medication for nausea and vomiting.