A nurse is reinforcing teaching with a newly licensed nurse about monitoring morphine patient-controlled analgesia (PCA). Which of the following information should the nurse include?

A. Only the client should operate the PCA pump to ensure self-administration within prescribed limits. B. Pain assessment should be more frequent, and the client's pain level should be assessed as needed, not on a fixed schedule. C. Morphine PCA allows the client to self-administer a predetermined dose, minimizing the risk of overdose or toxicity. D. Constipation, not diarrhea, is a common adverse effect of opioid medications, including morphine.