A nurse is reinforcing teaching with a client who is taking allopurinol about the risk for developing Stevens-Johnson syndrome. For which of the following manifestations should the nurse instruct the client to monitor and report?

Stevens-Johnson syndrome (SJS) is a severe and potentially life-threatening skin reaction that can occur as a rare but serious side effect of allopurinol. The initial symptom often presents as a skin rash, which can progress rapidly and involve other mucous membranes such as the mouth and eyes. Fever is commonly associated with SJS. Diplopia (double vision) is not a typical symptom of SJS. It refers to seeing two images instead of one and can be caused by various factors unrelated to allopurinol or SJS. Tinnitus with ear pain is not a characteristic symptom of SJS. It usually relates to issues with the auditory system, such as damage to the inner ear or other underlying conditions. Hyperreflexia (exaggerated reflexes) is not directly associated with SJS. It typically refers to an abnormal increase in the body's reflex responses and can be caused by conditions affecting the central nervous system or spinal cord.