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?

When taking allopurinol, a medication commonly used to treat gout and prevent kidney stones, the nurse should instruct the client to monitor and report the manifestation of a skin rash with fever. Stevens-Johnson syndrome (SJS) is a severe and potentially life-threatening condition that can occur as a rare side effect of allopurinol. It is characterized by a widespread rash, often with fever, and can progress to involve the mucous membranes (e.g., mouth, eyes) and cause severe complications. The other manifestations mentioned, such as diplopia (double vision), tinnitus with ear pain, and hyperreflexia (exaggerated reflexes), are not typically associated with Stevens-Johnson syndrome and should not be directly attributed to this condition. However, it's important for the client to report any unusual or severe symptoms to their healthcare provider for further evaluation and appropriate management.