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The aim of the present study was to determine the influence of severe renal dysfunction (estimated glomerular filtration rate <30 ml/min/1.73 m², including hemodialysis) on the pharmacokinetics and therapeutic effects of febuxostat using a population pharmacokinetic analysis. This study recruited patients with hyperuricemia who were initially treated with allopurinol, but were switched to febuxostat, and it consists of 2 sub-studies: a pharmacokinetic study (26 patients) and retrospective efficacy evaluation study (51 patients). The demographic and clinical data of patients were collected from electronic medical records. Plasma febuxostat concentrations were obtained at each hospital visit. Population pharmacokinetic modeling was performed with NONMEM version 7.2. A total of 128 plasma febuxostat concentrations from 26 patients were used in the population pharmacokinetic analysis. The data were best …