Abstract
Background
The aim of the present study was to estimate the population pharmacokinetic parameters of mizoribine in adult recipients of renal transplantation using a nonlinear mixed effects model (NONMEM) program.
Methods
Pharmacokinetic data for population analysis were retrospectively collected from 114 recipients (66 males and 48 females) routinely treated with oral administration of mizoribine (25–450 mg/day). The range of creatinine clearance (CLcr) was 7.6−136.1 mL/min (mean 49.2 mL/min).
Results
The pharmacokinetics of mizoribine in adult recipients of renal transplantation was well described by a 1-compartment model with first-order absorption. The mean value of the absorption lag time (ALAG) and absorption rate constant (KA) was estimated to be 0.581 and 0.983 h−1, respectively. Apparent volume of distribution (V/F) was modeled as a function of body weight (WT), and the mean value was estimated to be 0.858 × WT L. Oral clearance (CL/F) was modeled as a function of creatinine clearance (CLcr), and the mean value was estimated to be 1.80 × CLcr × 60/1000 L/h. In addition, there was a strong correlation between CLcr-corrected CL/F and WT-corrected V/F in the adult recipients, indicating large interindividual variability in bioavailability (F) of mizoribine.
Conclusion
The present findings suggested that not only the rate of renal excretion but also the extent of intestinal absorption of mizoribine is responsible for the large interindividual pharmacokinetic variability of the drug.
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Acknowledgments
The present study was executed as themes of secretaries of the study group of mizoribine on renal transplantation. The data in this study was collected by following 11 hospitals: Kyoto Prefectural University of Medicine, Osaka University, Hyogo College of Medicine, Ihara Clinic, Nara Medical University, Osaka City University, Sakai Hospital Kinki University faculty of Medicine, Kinki University Hospital, Hyogo Prefectural Nishinomiya Hospital, Yamaguchi-ken Saiseikai Shimonoseki General Hospital, and Hiroshima Prefectural Hospital. We are grateful to the doctors in these hospitals.
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Ishida, K., Okamoto, M., Ishibashi, M. et al. Population pharmacokinetics of mizoribine in adult recipients of renal transplantation. Clin Exp Nephrol 15, 900–906 (2011). https://doi.org/10.1007/s10157-011-0487-0
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DOI: https://doi.org/10.1007/s10157-011-0487-0