A patient in pain requests the prescribed pain medication, which is an opioid. Which nursing assessment is essential before administering the opioid?

Choice A reason: Blood pressure matters but isn’t primary; opioids rarely cause acute hypotension initially, and respiratory depression is a more immediate life-threatening risk. Choice B reason: Temperature is unrelated; opioids don’t primarily affect fever, and this assessment doesn’t address the critical safety concern of opioid administration. Choice C reason: Pulse is secondary; opioids may slow heart rate mildly, but respiratory suppression is the urgent risk, requiring priority monitoring before dosing. Choice D reason: Respiratory rate is critical; opioids depress the brainstem, risking apnea, and assessing breathing ensures safety before administering this high-risk medication.