Population pharmacokinetics of mycophenolate mofetil in Thai lupus nephritis patients

狼疮性肾炎 非金属 药代动力学 医学 霉酚酸 人口 系统性红斑狼疮 内科学 胃肠病学 药理学 移植 疾病 环境卫生
作者
Baralee Punyawudho,Paungpaga Lertdumrongluk,Poorichaya Somparn,Wonngarm Kittanamongkolchai,Opas Traitanon,Yingyos Avihingsanon,Somratai Vadcharavivad
出处
期刊:International Journal of Clinical Pharmacology and Therapeutics [Dustri-Verlag Dr. Karl Feistle]
卷期号:50 (04): 272-280 被引量:17
标识
DOI:10.5414/cp201605
摘要

Mycophenolic acid (MPA) has become the first-line drug therapy for proliferative lupus nephritis, a common and serious complication of systemic lupus erythematosus. Although a sufficient MPA exposure is required, a high interindividual variability in the pharmacokinetics of MPA has been observed. The knowledge of MPA pharmacokinetics in lupus nephritis patients is limited, especially in Asian patients. This study aimed to develop a population pharmacokinetic model for MPA and determine the population pharmacokinetic parameters and their interindividual variability in Thai patients with lupus nephritis.A total of 112 MPA plasma concentrations from 14 adult lupus nephritis patients (International Society of Nephrology/Renal Pathology Society Class III/IV) receiving mycophenolate mofetil were included in this study. The data was analyzed using NONMEM. The model evaluation was performed by the bootstrap approach and visual predictive check.A two-compartment model with a lag time best described the data. The estimated mean apparent clearance (CL/F) was 14.5 l/h with an interindividual variability of 45.2%. The estimated mean CL/F was found to be lower than the values previously reported. The estimated mean apparent volume of the central compartment was 12.2 l with an interindividual variability of 166%. None of the covariates were found to significantly influence MPA pharmacokinetics.In this study, a population pharmacokinetic model of MPA in severe lupus nephritis patients was successfully developed. The mean pharmacokinetic parameters were estimated and a high interindividual variability of MPA in this population was observed. This provides evidence to show that individualizing dosage regimens in this population is crucial. The model developed in this study could be used to obtain initial information for MPA dose adjustments in Thai and Asian patients with lupus nephritis. Further studies are required to validate the results and clarify the influence of covariates on MMF pharmacokinetics.
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