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- W2010357068 abstract "Tobacco consumption has been recognized as a factor mediating the interindividual variations in olanzapine's pharmacokinetics and pharmacodynamics. The primary objective of this study was to describe the dose effect of smoking on the dose-plasma concentration relationship and the pharmacokinetics of oral olanzapine in male schizophrenic patients using high-performance liquid chromatography coupled with electrochemical detector. Twenty-seven male schizophrenic inpatients were recruited and were stratified into the following groups according to smoking behaviors: non-smokers (n=9), light-smokers (1-4 cigarettes per day; n=9), and heavy-smokers (>or=5 cigarettes per day; n=9). Plasma olanzapine concentrations were determined up to 120 h following a single oral dose of 10 mg olanzapine. The pharmacokinetic parameters were calculated by the non-compartment method using WinNonlin software. Results show that there was a significant correlation among non-smokers (n=9; 0.79; p=0.01) or combined with light-smokers (n=18; 0.62; p<0.01) between peak plasma olanzapine concentrations (Cmax) and their individual dose-corrected by body weight, but this correlation did not appear in heavy-smokers. There were no significant differences between non-smokers and light-smokers except for significant decreased AUC0-->120 by 45.1% in light-smokers. The mean C(max) and the mean area under the plasma concentration-time curve from time zero to 120 h (AUC0-->120) of the heavy-smoking patients was 9.3+/-4.3 ng/ml (65.2% reduction compared to the non-smokers) and 302.4+/-167.8 h ng/ml (67.6% reduction compared to the non-smokers), respectively. In summary, a daily consumption of 5 cigarettes is probably sufficient for induction of olanzapine metabolism. Smoking cessation is recommended for olanzapine therapy to have better prediction for therapeutic dosages particularly in heavy-smokers. Compared to non-smokers, heavy-smokers therefore require a 50-100% increase in olanzapine doses. Therapeutic drug monitoring will need to be considered when schizophrenic patients change their smoking behaviors." @default.
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- W2010357068 date "2008-12-01" @default.
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- W2010357068 title "Pharmacokinetics of olanzapine in Chinese male schizophrenic patients with various smoking behaviors" @default.
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- W2010357068 doi "https://doi.org/10.1016/j.pnpbp.2008.08.022" @default.
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