A nurse is caring for a client who has cirrhosis and a prescription for lactulose. Following administration, the nurse should monitor the client for which of the following adverse effects?

A. Diarrhea: Lactulose draws water into the bowel and increases stool frequency; diarrhea is a common intended/adverse effect and can lead to dehydration and electrolyte imbalances. B. Peripheral edema: Peripheral edema is related to fluid overload/albumin shifts in cirrhosis, not a typical adverse effect of lactulose. C. Dry mouth: Dry mouth is not a common adverse effect of lactulose; GI effects (bloating, flatulence, diarrhea) are more likely. D. Headache: Headache is not a characteristic adverse effect of lactulose therapy.