A postoperative patient reports pain of 8/10. Before adminis…

A pоstоperаtive pаtient repоrts pаin of 8/10. Before administering the prescribed IV morphine, the nurse assesses the patient’s respiratory rate as 14/min, oxygen saturation as 96% on room air, and level of consciousness as alert. The nurse administers the morphine as prescribed. Twenty minutes later, the patient reports the pain is now 5/10. The nurse reassesses the patient and notes a respiratory rate of 8/min and is increasingly difficult to arouse during the assessment. What action should the nurse take first?