The client is receiving fentanyl transdermal patch 25 mcg/hr. Which nursing intervention is most important for the nurse to initiate?

A. Observe the client’s mucous membranes: While mucous membrane assessment can indicate hydration status, it is not the highest priority when managing fentanyl therapy, which primarily risks respiratory depression and sedation. B. Assess the client’s level of consciousness (LOC): Fentanyl, a potent opioid, can cause sedation and respiratory depression. Monitoring LOC is critical to detect early signs of opioid toxicity and ensure patient safety. C. Auscultate the client’s bowel sounds: Opioids can cause constipation by decreasing gastrointestinal motility, but bowel sounds assessment is secondary to monitoring respiratory and neurological status. D. Record the client’s urinary output: Although opioids may affect urinary retention, urinary output monitoring is less immediately critical compared to assessing LOC and respiratory function with fentanyl use.