A client intentionally overdosed on an opioid drug. What is an appropriate nursing action?

A. Administer flumazenil: Flumazenil reverses benzodiazepines, not opioids. Giving it in an opioid overdose would provide no therapeutic benefit and could complicate care by masking overlapping sedative effects from unknown co‑ingested substances. B. Encourage ambulation: Clients with opioid overdose often have depressed consciousness, poor respiratory effort, and impaired safety awareness. Ambulation increases the risk of falls, injury, and worsened hypoxia, making it unsafe during the acute phase. C. Assess the airway: Opioids depress the respiratory center, making airway assessment the highest priority. Ensuring patency, evaluating respiratory rate and depth, and preparing for ventilation support align with ABC priorities and help prevent respiratory arrest. D. Request a sedative: Sedating a client who already has CNS and respiratory depression from opioids can further suppress breathing and worsen hypoventilation. This would significantly increase the risk of respiratory failure.