A nurse is caring for a patient who has been prescribed a sulfonamide antibiotic for a urinary tract infection. Which of the following patient statements indicates a need for further teaching?

A. "I will drink plenty of water while taking this medication.": Increasing fluid intake helps prevent crystalluria, a potential side effect of sulfonamides. Maintaining adequate hydration protects kidney function and promotes proper drug excretion. B. "I should avoid prolonged sun exposure.": Sulfonamides can cause photosensitivity reactions, making the skin more prone to sunburn. Clients should use sunscreen and protective clothing when outdoors to minimize the risk of skin irritation or burns. C. "I can stop the medication once I feel better.": Stopping the antibiotic early can lead to incomplete bacterial eradication and promote resistance. The client should be instructed to complete the entire prescribed course, even if symptoms resolve before finishing medication. D. "I will report any rash to my healthcare provider.": Reporting rashes is essential, as sulfonamides can cause hypersensitivity reactions, including Stevens-Johnson syndrome. Prompt reporting allows for early intervention and prevention of severe complications.