Drug-induced lupus erythematosus secondary to nafcillin: the first reported case.

With an estimated incidence of 15-30,000 cases per year in the United States, drug-induced lupus erythematosus (DIL) is an uncommon iatrogenic condition. The number of implicated medications increases each year. We report the first case of DIL secondary to nafcillin administration in a patient with a prosthetic aortic valve and methicillin-sensitive Staphylococcus aureus who developed a facial rash and lower back pain.