Clin Psychopharmacol Neurosci.  2019 Aug;17(3):423-431. 10.9758/cpn.2019.17.3.423.

Switching Antipsychotics to Blonanserin in Patients with Schizophrenia: An Open-label, Prospective, Multicenter Study

  • 1Department of Psychiatry, College of Medicine, The Catholic University of Korea, Seoul, Korea.
  • 2Department of Psychiatry, Naju National Hospital, Naju, Korea.
  • 3Department of Psychiatry, Konkuk University School of Medicine, Chungju, Korea.
  • 4Department of Psychiatry, Wonkwang University School of Medicine, Iksan, Korea.
  • 5Department of Psychiatry, Bongseng Memorial Hospital, Busan, Korea.
  • 6Department of Neuropsychiatry, Presbyterian Medical Center-Jesus Hospital, Jeonju, Korea.
  • 7Department of Psychiatry, School of Medicine, Kyungpook National University, Daegu, Korea.
  • 8Department of Psychiatry, College of Medicine, Dongguk University, Gyeongju, Korea.
  • 9Department of Psychiatry, School of Medicine, Catholic University of Daegu, Daegu, Korea.


This study was performed to investigate the efficacy and tolerability of blonanserin in schizophrenic patients who were previously treated with other antipsychotics but, due to insufficient response, were switched to blonanserin.
A total of 52 patients with schizophrenia who were unresponsive to treatment with antipsychotic monotherapy or combination therapy were recruited into this 12-week, open-label, prospective, multicenter study. Patients were switched to blonanserin from their existing antipsychotics over a maximum 2-week tapering-off period. Efficacy was primarily evaluated using the 18-item Brief Psychiatric Rating Scale (BPRS). Assessments were performed at baseline, and at weeks 1, 2, 4, 8, and 12.
Switching to blonanserin resulted in a significant decrease in the mean total score on the BPRS from baseline (56.8 ± 9.4) to week 12 (42.1 ± 13.8, p < 0.001). The most common adverse events were extrapyramidal symptoms (n = 12, 23.1%), insomnia (n = 10, 19.2%), and emotional arousal (n = 6, 11.5%). Overweight or obese patients (body mass index ≥ 23 kg/m2, n = 33) who switched to blonanserin exhibited significant weight loss from 75.2 ± 9.3 kg at baseline to 73.5 ± 9.2 kg at week 12 (p = 0.006). The total cholesterol (baseline, 236.1 ± 47.6 mg/dl; endpoint [week 12], 209.9 ± 28.0 mg/dl; p = 0.005) and prolactin levels (baseline, 80.0 ± 85.2 ng/ml; endpoint [week 12], 63.2 ± 88.9 ng/ml; p = 0.003) were also significantly improved in patients with hypercholesterolemia or hyperprolactinemia.
The results of the present study suggest that switching to blonanserin may be an effective strategy for schizophrenic patients unresponsive to other antipsychotic treatments.


Blonanserin; Treatment outcome; Prolactin; Body weight
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