Bioavailability Assessment of Disopyramide Using Pharmacokinetic-Pharmacodynamic (PK-PD) Modeling in the Rat
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概要
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The relationship between the serum concentration and the pharmacological effect of disopyramide was investigated quantitatively to estimate the extent of its oral bioavailability (EBA_<p.o.>) and to evaluate the drug interaction with miconazole, a CYP3A4 inhibitor. An integrated pharmacokinetic-pharmacodynamic (PK-PD) model was used to describe the relationship between the serum concentrations and changes in QT interval (pharmacological data) of disopyramide after intra-vascular infusion for 15 min (i.v. short-term infusion) to rats. A two-compartment model was applied to the pharmacokinetics of disopyramide. The pharmacological data after short-term infusion were well explained using a PK-PD link model. To validate the present PK-PD model, disopyramide was administered intra-vascularly in separate experiments, and the doses were predicted only from the pharmacological data. The model predicted doses were identical to the actual doses, regardless of the dosing rates. This result indicates that the PK-PD model used in the present study is appropriate, and that the relationship between the serum concentrations and changes in QT intervals is independent of the dosing (input) rate. When miconazole was co-administered orally 1 h before disopyramide infusion, the serum disopyramide concentrations were significantly higher than that following disopyramide alone. The raised serum concentrations under miconazole co-administration were well explained by nonlinear elimination clearance. The pharmacological effects of disopyramide under miconazole co-administration, were also greater than those following disopyramide alone. The results of the PK-PD analysis indicated that the enhanced pharmacological response under miconazole co-administration was simply caused by a pharmacokinetic change. The EBA_<p.o.> values estimated from the pharmacological effects predicted the observed values reasonably well. In conclusion, we demonstrated following : (1) the pharmacological effect after intra-vascular administration of disopyramide is related quantitatively to the serum concentrations using a PK-PD model; (2) miconazole affects only the elimination clearance of disopyramide to enhance the pharmacological effect; (3) the EBA of disopyramide can estimated reasonably only well from the pharmacological data using the PK-PD model; (4) there is no dosing-rate-dependent or dosing-route-dependent pharmacological effect of disopyramide.
- 公益社団法人日本薬学会の論文
- 2000-11-01
著者
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Kakemi M
Department Of Pharmaceutics Osaka University Of Pharmaceutical Sciences
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Kakemi Masao
大阪薬科大学 薬剤学
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MORIMOTO Kazuhiro
Department of Pharmaceutics, Graduate School of Pharmaceutical Sciences, Hokkaido Pharmaceutical Uni
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MIYAZAKI Makoto
Department of Pharmaceutics, Osaka University of Pharmaceutical Sciences
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IWANAGA Kazunori
Department of Pharmaceutics, Osaka University of Pharmaceutical Sciences
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Miyazaki Michiko
School of Pharmaceutical Sciences, Showa University
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Kakemi M
Osaka Univ. Pharmaceutical Sci. Takatsuki Jpn
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KAKEMI Masawo
Department of Pharmaceutics, Osaka University of Pharmaceutical Sciences
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Miyazaki Makoto
Department Of Pharmaceutics Osaka University Of Pharmaceutical Sciences
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Morimoto Kazuhiro
Department Of Applied Chemistry Faculty Of Engineering Doshisha University
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Morimoto K
Hokkaido Pharmaceutical University School Of Pharmacy
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MAEKAWA Chieko
Department of Pharmaceutics, Osaka University of Pharmaceutical Sciences
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Maekawa Chieko
Department Of Pharmaceutics Osaka University Of Pharmaceutical Sciences
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Iwanaga Kazunori
Department Of Pharmaceutics Osaka University Of Pharmaceutical Sciences
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Miyazaki Makoto
Department Of Mechanical Engineering And Intelligent Systems The University Of Electro-communication
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Miyazaki Makoto
Department of Applied Chemistry, Faculty of Engineering, Kansai University
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