Table of Contents Author Guidelines Submit a Manuscript
Journal of Pharmaceutics
Volume 2014, Article ID 713650, 7 pages
http://dx.doi.org/10.1155/2014/713650
Research Article

The Population Pharmacokinetic Models of Tacrolimus in Chinese Adult Liver Transplantation Patients

1Department of Pharmacy, Tianjin First Central Hospital, Tianjin 300192, China
2Basic Medical College, Tianjin Medical University, Tianjin 300070, China
3Department of Liver Transplantation, Tianjin First Central Hospital, Tianjin 300192, China
4Department of Liver Transplantation, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, China

Received 18 November 2013; Revised 7 January 2014; Accepted 8 January 2014; Published 13 February 2014

Academic Editor: Pradeep Tyagi

Copyright © 2014 Liqin Zhu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Aim. The aim of this study was to establish population pharmacokinetic models of tacrolimus in Chinese adult liver transplantation patients. Methods. Tacrolimus dose and concentration data were obtained from 47 Chinese adult liver transplant recipients, and the data were analyzed using a nonlinear mixed-effect modeling (NONMEM) method. Results. The structural model was a two-compartment model with first-order absorption. The typical population values of tacrolimus for the pharmacokinetic parameters of apparent clearance ( ), apparent distribution volume of the central compartment ( ), intercompartmental clearance ( ), apparent distribution volume of the peripheral compartment ( ), and absorption rate ( ) were 11.2 L/h, 406 L, 57.3 L/h, 503 L, and 0.723 h−1, respectively. The interindividual variabilities of these parameters were 16.2%, 163%, 19.7%, 199%, and 74.3%, respectively, and the intraindividual variability of observed concentration was 26.54%. The covariates retained in the final models were postoperative days (POD) and dosage per day (DOSE) on . Conclusion. Population pharmacokinetic models of tacrolimus were developed in Chinese adult liver transplant patients. These results could provide the interpretation of the outcome of pharmacokinetics modeling and the impact of covariate tested on individualized tacrolimus therapy.