Atypical neuroleptic malignant syndrome associated with clozapine treatment.

Clozapine is an atypical neuroleptic drug that was initially thought not to cause neuroleptic malignant syndrome (NMS). The authors report a case of NMS associated with clozapine use, developed in a patient without previous history of NMS. Considering that 13 such cases (including ours) have been reported so far, NMS should be considered in the differential diagnosis of a febrile patient treated with clozapine.