Recurrent Antineutrophil Cytoplasmic Antibody-Associated Vasculitis Induced by Levamisole-Adulterated Cocaine.

Levamisole, an anthelmintic and immunomodulatory drug, was withdrawn from the US market in 1999 due to adverse effects, including agranulocytosis and vasculitis. In recent years, levamisole has been used as a common cocaine adulterant, and its use has led to an autoimmune syndrome characterized by an antineutrophil cytoplasmic antibody-associated vasculitis presenting with necrotic retiform purpura on the face and extremities. We present a case of recurrent levamisole-induced vasculitis initially misdiagnosed as systemic lupus erythematosus to highlight this easily misdiagnosed entity and to demonstrate re-exposure leading to recurrent vasculitis with more extensive clinical manifestations.