Ticlopidine-induced lupus. 
Ticlopidine is a widely used drug for prevention of stroke and other serious vascular events with a multitude of possible side effects.  An increasing number of drugs are being recognized as the triggering agents of drug-induced lupus.  We describe three patients in whom the etiologic connection between ticlopidine and lupus was supported by the appearance of lupus-like features (fever, rash, arthritis, renal involvement, positive antinuclear and antihistone antibodies), shortly after drug initiation, and their gradual resolution after its discontinuation.  If suggested by clinical or/and laboratory findings (fever of unknown cause, musculoskeletal involvement, hematologic abnormalities), the possibility of ticlopidine-induced lupus should be taken into consideration and appropriate investigations should be performed.  Patients should resolve slowly but completely after withdrawal of ticlopidine.