We present a case of acute liver failure requiring emergency liver transplant due to trimethoprim-induced drug reaction with eosinophilia and systemic symptoms (DRESS) and associated reactivation of human herpesvirus 6. The case highlights the importance of early recognition, stopping offending drug, and initiating corticosteroids to prevent the poor outcome. Drug reaction with eosinophilia and systemic symptoms (DRESS) is a poorly recognized syndrome, which can lead to significant cutaneous, hematologic, and solid organ dysfunction. It may present with an insidious and nonspecific feature, leading to a delay in diagnosis. As this case illustrated, failure to recognize the condition in its earliest stages, stop the culprit drug, and initiate corticosteroid treatment may lead to a dramatically poor outcome for the patient. Our case outlines the clinical features of DRESS presenting to a physician, which can easily be mistaken for a viral illness. It highlights the role of acute liver failure units and emergency liver transplantation in severe cases progressing to liver failure. It also adds to the limited reports in the literature of positive outcomes following rescue liver transplantation in the context of severe DRESS. 2 | CASE HISTORY AND EXAMINATION A 22-year-old Caucasian woman had a 3-week history of fluctuating fatigue, pyrexia, malaise, sweats, and myalgia presented to a local hospital with worsening symptoms, jaundice, and a macular rash starting on hands and feet that spread to rest of body. A week prior to hospitalization she also experienced nausea,