Methotrexate Failure in the Treatment of Adult-Onset Still's Disease: A Case Report

Adult-onset Still's disease (AOSD) is a rheumatological condition associated with significant morbidity and mortality. Typically a diagnosis of exclusion, the therapeutic management has relied mainly on symptom control and immune suppression. Methotrexate (MTX), a disease-modifying anti-rheumatoid drug (DMARDs), has become a drug of choice in treating several autoimmune conditions, including AOSD. Unfortunately, despite being largely effective, this medication can result in treatment failure, exacerbation, and a flare of symptoms. We present the case of a 31-year-old male who presented to us with weakness and palpitations, who was ultimately found to have a flare of his Still's disease, despite being on MTX therapy. Our hope is to encourage a suspicion for treatment failure in patients with similar symptoms, in order to encourage a faster initiation of alternative therapies to alleviate their discomfort.