A nurse is administering morphine 2 mg IV every 2 to 4 hr to a client who has an abdominal incision. The nurse should monitor the client for which of the following adverse effects?

Rationale: A. Morphine more commonly causes constipation due to decreased gastrointestinal motility, not diarrhea. B. Hiccups are not a typical adverse effect of morphine administration. C. Morphine can cause peripheral vasodilation and histamine release, which may lead to orthostatic hypotension, especially with IV administration. The nurse should monitor blood pressure closely. D. Heartburn is not a recognized adverse effect of morphine. Gastrointestinal effects are more likely to include nausea, vomiting, and constipation.