Neuroleptic malignant syndrome: description of two cases with prolonged clinical course.

Two cases of neuroleptic malignant syndrome presenting an unusual clinical course are reported. The first patient was untreated for the syndrome and recovered completely only after four months, while the other one was given dopaminergic and myorelaxing drugs only 10 days after the onset of the symptoms and died about six months later with an unmodified clinical picture. In both cases the treatment seemed to influence the clinical course, a delay or lack of drug intake worsening the prognosis.