Fluperlapine (NB 106 689), a dibenzazepine chemically and pharmacologically similar to clozapine, was investigated in 28 patients with regard to antipsychotic efficacy and occurrence of adverse effects. In an open early phase II study patients were given fluperlapine over a period of 26 days. The average daily dosage was 300 mg. Five patients had to be withdrawn from the trial during the first week due to side effects or therapeutic inefficacy, 23 patients were examined during the period planned. The substance proved to have fast-acting antipsychotic effect with few adverse effects and no extrapyramidal motor disturbances.
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