[Malignant neuroleptic syndrome or serotonergic syndrome].

The malignant neuroleptica syndrome (MNS) and the serotonin syndrome (SS) can be impossible to differentiate. This case history describes clinical symptoms compatible with either MNS or SS in a 59-year-old schizophrenic male patient, who had been heavily medicated with antipsychotics for several years in close relation to initiation of new treatment with a SSRI compound. The case shows that it is important to have both syndromes in mind when chronically ill patients are treated with several medicaments.