Final answer:
The best plan to address constipation caused by ferrous sulfate is to increase fluids and high-fiber foods in the client's diet, which helps normalize bowel function.
Step-by-step explanation:
When a client complains of constipation while receiving ferrous sulfate (Feosol), the best plan by the nurse to assist the client in resolving this common side effect is to teach the client to increase fluids and high-fiber foods in the diet. Increasing the intake of fluids and incorporating high-fiber foods are beneficial for maintaining normal bowel movements and can alleviate constipation. Sources of insoluble fiber, such as whole wheat, wheat bran, beans, and potatoes, add bulk to feces and help food waste move through the intestines more effectively, while soluble fiber supplements can provide relief from various gastrointestinal issues.