Naloxone is administered to an adult client following a suicide attempt with an overdose of hydrocodone bitartrate. Within 15 minutes, the client is alert and oriented. In planning nursing care, which intervention has the highest priority at this time?

A. Determine the client’s reason for attempting suicide: While assessing suicidal intent is important, the immediate priority is ensuring the client's physiological stability. Suicidal ideation can be addressed once the client is medically stable. B. Obtain the client’s serum hydrocodone/acetaminophen level: This may be ordered, but it is not the highest priority. Clinical observation is more urgent, especially because naloxone has a shorter half-life than many opioids, including hydrocodone. C. Encourage the client to increase fluid intake: This is not a priority intervention in the immediate post-overdose period and does not address the risk of opioid rebound toxicity. D. Observe the client for further narcotic effects: Naloxone has a short duration of action (typically 30–90 minutes), whereas hydrocodone has a longer half-life. Once naloxone wears off, respiratory depression and sedation can recur. Continuous monitoring is critical to ensure timely re-administration if opioid effects return.