A patient who is receiving the sulfonamide medication, trimethoprim/sulfamethoxazole for an urinary tract infection. On entering the room the nurse notices the patient presents with a red-to-purple rash that is reported as painful. Which response by the nurse is most appropriate?

A. "I can get a bath started. Sitting in the tub can help with the itching": While baths may relieve mild itching, a painful red-to-purple rash from trimethoprim/sulfamethoxazole may indicate a severe hypersensitivity reaction, such as Stevens-Johnson syndrome, which requires immediate action rather than symptomatic care. B. "This is an expected side effect. The symptoms are harmless and will go away within a day or two": A painful, spreading rash is not harmless and is not a common side effect of sulfonamides. Dismissing it could delay urgent treatment and place the patient at serious risk. C. "I will administer diphenhydramine to reverse these symptoms": Antihistamines may help mild allergic reactions but cannot reverse severe mucocutaneous reactions like Stevens-Johnson syndrome. Immediate discontinuation and medical evaluation are required. D. "I will stop this medication immediately and consult your physician for further orders": Stopping the suspected medication and notifying the provider is critical to prevent progression of a potentially life-threatening hypersensitivity reaction. Prompt medical intervention and supportive care are necessary.