DRESS is a Mess: A Case of Cross Reactivity Between Lacosamide and Lamotrigine.

Drug reaction with eosinophilia with systemic symptoms (DRESS) syndrome is a rare drug reaction often presenting with both cutaneous manifestations and potentially life-threatening internal organ involvement. The precise incidence of DRESS is still unclear as it is easily missed due to its highly variable clinical presentation. However, with an expected mortality rate of approximately 10 percent, it is important for clinicians to be familiar with pharmacologic etiologies commonly implicated in the pathogenesis. We present a case of DRESS syndrome attributed to cross-reactivity between two commonly used anticonvulsants- lacosamide and lamotrigine.