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Factorial analysis of premeal and postmeal equivalence of mirtazapine bioequivalence test |
LI Wen LU Shousi ZHANG Tingting LIU Ping SONG Jie DUAN Yunxia QIAO Hong |
Research Ward, China Rehabilitation Research Center Beijing Boai Hospital, Beijing 100068, China |
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Abstract Objective To evaluate the bioequivalence and safety of two Mirtazapine Tablets in healthy Chinese subjects. Methods Plasma concentrations of Mirtazapine Tablets were measured by liquid chromatography-tandem mass spectrometry (LC-MS/MS). The pharmacokinetic parameters were calculated and bioequivalence was evaluated under the two conditions. Results Non-atrioventricular model was used to calculate the pharmacokinetic parameters. The geometric mean ratios of Cmax, AUC0-t, and AUC0-∞ in plasma of mirtazapine test preparation/reference preparation in fasting group were 127.85%, 113.03%, and 113.18%, respectively. The 90% confidence intervals (90%CI) were 108.42%-150.75%, 105.96%- 120.57%, 106.03%-120.81%, respectively, and the Cmax 90%CI did not completely fall within 80.00%-125.00% and was not equivalent. The geometric mean ratios of the main pharmacokinetic parameters of plasma Cmax, AUC0-t, and AUC0-∞ of the test preparation/reference preparation of mirtazapine in postprandial group were 95.48%, 99.71%, and 99.74%, respectively. The 90%CI was 83.01%-109.84%, 92.65%-107.31%, 92.36%-107.70%, respectively. 90%CI completely fell within 80.00%-125.00%. Conclusion The tested preparation Mirtazapine Tablets have the characteristics of postprandial bioequivalence and fasting non-equivalence, so it is necessary to optimize the factors of drug preparation, pharmacokinetics and strengthening subject management to achieve the equivalence with the reference preparation.
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