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KMID : 0369820090390020111
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Jorunal of Korean Pharmaceutical Sciences
2009 Volume.39 No. 2 p.111 ~ p.115
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Relative Bioavailability and Pharmacokinetics of Newly Designed Cyclosporin A Self-microemulsifying Formulation after Single and Multiple Doses to Dogs
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Yang Su-Geun
Shin Hee-jong
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Abstract
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The pharmacokinetics of cyclosporin A (CsA) after single and multiple oral dosing of new CsA self-micro-emulsifying drug delivery system (SMEDDS) in dogs were estimated. A single dose study was performed following a two-way crossover design against six dogs with reference SMEDDS. For a multiple dose study, three dogs were allocated for each drug, and 100 mg of drug was administered daily for 6 days. Whole blood concentration of CsA was analyzed by radio-immunoassay. Both drug showed identical blood concentration profiles in both studies, and no statistical difference was detected in pharmacokinetic parameters. The relative bioavailabilities of test SMEDDS were 91.4% and 89.1%, respectively, in the single dose study and the last day of multiple dose study. Especially, multiple dose study proved the good relationship between C-0/C-2 and AUC for reference SMEDDS, which is an indispensable part of therapeutic drug monitoring. These results suggest newly formulated CsA SMEDDS possibly shows identical pharmacokinetics and pharmacodynamic behaviors in clinical trials.
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KEYWORD
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Cyclosporin A, Single dose, Multiple dose, Microemulsion, SMEDDS (self-microemulsifying drug delivery system), Pharmacokinetics
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