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Antipsychotic polypharmacy in patients with schizophrenia: a multicentre comparative study in East Asia
Author(s) -
Sim Kang,
Su Alex,
Fujii Senta,
Yang Shuyu,
Chong MianYoon,
Ungvari Gabor S.,
Si Tianmei,
Chung Eun K.,
Tsang HinYeung,
Chan Yiong H.,
Heckers Stephan,
Shinfuku Naotaka,
Tan Chay H.
Publication year - 2004
Publication title -
british journal of clinical pharmacology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.216
H-Index - 146
eISSN - 1365-2125
pISSN - 0306-5251
DOI - 10.1111/j.1365-2125.2004.02102.x
Subject(s) - polypharmacy , antipsychotic , medicine , schizophrenia (object oriented programming) , odds ratio , medical prescription , psychiatry , confidence interval , pharmacology
Aims Previous studies of the prescription patterns of psychotropic medications in patients with schizophrenia have highlighted a high rate of antipsychotic polypharmacy, but data in Asia are sparse. This study seeks to examine the prevalence of antipsychotic polypharmacy in patients with schizophrenia and compare the differences between patients receiving one vs. those receiving more than one antipsychotic. Methods Antipsychotic prescription for a sample of 2399 patients with schizophrenia from six countries and territories was evaluated. Daily doses of antipsychotic medications were converted to standard chlorpromazine equivalents (CPZ). Results Antipsychotic polypharmacy was found in 45.7% ( n = 1097) of the patients with wide intercountry variations. Polypharmacy was associated with male gender [odds ratio (OR) 1.24, 95% confidence interval (CI) 1.06, 1.46, P < 0.01], advanced age ( t = −7.81, d.f. = 2396, P < 0.001), psychiatric hospital setting (OR 1.34, 95% CI 1.11, 1.62) as well as higher daily CPZeq doses (411.47 vs. 983.10 CPZeq day −1 , z = −25.94, P < 0.001), anticholinergic use (OR 3.17, 95% CI 2.65, 3.79, P < 0.001) and less use of an atypical antipsychotic drug (OR 0.83, 95% CI 0.71, 0.98, P < 0.05). On multivariate analysis, country, age and duration of illness were significantly associated with antipsychotic polypharmacy. Conclusion This study highlighted the wide intercountry variations of antipsychotic polypharmacy which are likely to be influenced by a complex combination of clinical, setting, cultural and personal practice factors, requiring more research.