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?

"Instruct the client's visitors not to operate the PCA pump.

"Check the client's pain level every 8 hours.

"Using morphine PCA increases the client's risk of toxicity."

"Diarrhea is an adverse effect of morphine PCA"