A nurse is caring for a client who is postoperative and develops respiratory depression after receiving morphine for pain control. Which of the following medications should the nurse expect the provider to prescribe?

A. Calcium gluconate: This medication is used to treat conditions such as hypocalcemia or magnesium toxicity and has no role in reversing opioid-induced respiratory depression. Its effects do not impact opioid receptors or respiratory drive. B. Naloxone: Naloxone is an opioid antagonist that rapidly reverses opioid-induced respiratory depression by displacing opioids from receptor sites. It restores ventilation within minutes and is the primary treatment for acute opioid toxicity in postoperative settings. C. Diphenhydramine: This antihistamine is used for allergic reactions or as a sedative but can worsen CNS depression. It offers no therapeutic benefit for treating respiratory depression caused by morphine. D. Flumazenil: Flumazenil reverses benzodiazepine-induced sedation, not opioid effects. Administering flumazenil would not improve respiratory status in a client experiencing opioid-related complications.