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Association between the high-dose use of benzodiazepines and rehospitalization in patients with schizophrenia: a 2-year naturalistic study

Authors Takita Y, Takaesu Y, Ono K, Futenma K, Shimura A, Murakoshi A, Komada Y, Inoue Y, Inoue T

Received 2 August 2016

Accepted for publication 11 October 2016

Published 15 December 2016 Volume 2016:12 Pages 3243—3247


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 2

Editor who approved publication: Dr Taro Kishi

Yukika Takita,1 Yoshikazu Takaesu,1 Kotaro Ono,1 Kunihiro Futenma,1 Akiyoshi Shimura,1 Akiko Murakoshi,1 Yoko Komada,2 Yuichi Inoue,1,2 Takeshi Inoue1

1Department of Psychiatry, 2Department of Somnology, Tokyo Medical University, Tokyo, Japan

Background: High-dose use of benzodiazepines (BZPs) reportedly causes adverse effects on cognitive function and quality of life in patients with schizophrenia. However, effects of BZPs on the clinical course of schizophrenia have not been clarified. This study was set out to investigate the association between BZPs and rehospitalization of patients with schizophrenia.
Methods: In this retrospective study, patients with schizophrenia who were discharged from Tokyo Medical University Hospital between January 2009 and February 2012 were eligible as subjects. One hundred and eight patients who continued treatment for >2 years after hospital discharge were included in this study. Clinical characteristics, doses of prescribed medication such as BZPs and antipsychotics, and Global Assessment of Functioning scores at discharge were investigated. The primary outcome was rehospitalization of patients for any reason.
Results: In a total of 108 subjects with schizophrenia, 44 subjects (40.7%) experienced rehospitalization during the 2-year study period. A multivariate analysis by the Cox proportional hazards model revealed that low educational history (hazard ratio =2.43, P=0.032), younger onset age of schizophrenia (hazard ratio =2.10, P=0.021), and higher diazepam-equivalent dose (hazard ratio =6.53, P=0.011) were significantly associated with the time to rehospitalization after hospital discharge.
Conclusion: The results of this study suggest that high-dose use of BZPs at discharge in patients with schizophrenia might be associated with a shorter time to rehospitalization.

Keywords: schizophrenia, rehospitalization, risk factor, high-dose benzodiazepine, Cox proportional hazards model

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