A nurse is caring for a client who is taking sucralfate. Which of the following outcomes indicates a therapeutic effect of the medication?

The correct answer is A: Relief of gastrointestinal pain. Sucralfate is a medication that forms a protective layer over ulcers in the stomach and intestines, helping to relieve pain and promote healing. Therefore, relief of gastrointestinal pain indicates a therapeutic effect. Choice B, improvement of impaired vision, is not related to sucralfate use. Choice C, prevention of opportunistic infections, is not a known effect of sucralfate. Choice D, alleviating Helicobacter pylori infection, is typically managed with antibiotics rather than sucralfate.