Leflunomide is a novel drug recently introduced for treatment of rheumatoid
arthritis as a DMARD (disease-modifying antirheumatic drug). So far, leflu
nomide has not been associated with severe bone marrow toxicity and pancyto
penia. We report of a 62-year-old woman with a 14-year history of rheumatoi
d arthritis with bone marrow toxicity and reversible pancytopenia developin
g after treatment with leflunomide.