A Study to Evaluate the Pharmacokinetics of VI-0521 Subjects With Renal Impairment

VI-0521, a fixed dose combination of immediate-release (IR) phentermine and controlled-release (CR) topiramate, is in Phase III clinical development as a potential therapy for obesity. In human, both phentermine and topiramate are primarily cleared by renal excretion. The contribution of hepatic metabolism to elimination of phentermine and topiramate is not significant. Obese patients, the proposed indicated population for future treatment with VI-0521, are likely to have renal impairment. Therefore, this study is important in understanding the effect of renal impairment on the pharmacokinetics of topiramate and phentermine in subjects with renal impairment compared to subjects with normal renal function.