RISPERIDONE VERSUS PERPHENAZINE IN THE TREATMENT OF CHRONIC-SCHIZOPHRENIC PATIENTS WITH ACUTE EXACERBATIONS

Risperidone (RIS), a new neuroleptic with 5-HT2- and dopamine D2 recep tor-blocking properties, was compared with perphenazine (PER) in a dou ble-blind, multicentre, parallel-group study in 107 chronic schizophre nics with acute exacerbation. RIS 5-15 mg or PER 16-48 mg daily was gi ven for 8 weeks. Psychopathology was assessed with the Positive and Ne gative Syndrome Scale (PANSS) and Clinical Global Impression. Seventy- eight patients completed the trial; there was an equal number of dropo uts on both drugs. The mean daily dose at endpoint was 8.5 mg RIS and 28 mg PER. The reduction in total PANSS score to endpoint did not diff er significantly, although there was a tendency in favour of RIS. The number of patients with predominantly negative symptoms who showed at least 20% reduction in total PANSS score was significantly larger in t he RIS group. Furthermore, the number of patients showing at least 20% reduction in Brief Psychiatric Rating Scale (BPRS) score (BPRS being a subscale of PANSS) was significantly larger in the RIS group. The ho stility cluster of BPRS improved more on RIS than on PER in the endpoi nt analysis. The overall prevalence of side effects was fairly similar in the two groups.