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  • Title: Effect of mild and moderate hepatic impairment on the pharmacokinetics and safety of carisbamate.
    Author: Moore K, Zannikos P, Solanki B, Greenspan A, Verhaeghe T, Brashear HR.
    Journal: J Clin Pharmacol; 2012 May; 52(5):738-46. PubMed ID: 21566203.
    Abstract:
    This open-label, parallel-group study was designed to characterize the pharmacokinetics (PK) of carisbamate in participants with mild or moderate hepatic impairment versus those with normal hepatic function. Healthy (n = 10) and hepatic-impaired (n = 20) participants received a single 200-mg oral dose of carisbamate. Serial PK blood samples were collected up to 120 hours postdose. A modest increase in mean area under the plasma concentration-time curve from 0 to infinity (AUC(∞)) was observed for the mild impairment group compared with the normal group (ratio of geometric means ~116%), while mean maximum plasma concentration (C(max)) values were similar (ratio of geometric means ~94%). The AUC(∞) value for the moderate hepatic-impaired group was approximately 207% that of the normal group, while there was a smaller increase in C(max) (~118%) compared with the normal group. Mean half-life (t(1/2)) values were prolonged in the moderate impairment group (21 hours) relative to the normal group (11 hours). There was a decrease in apparent clearance (CL/F) and an increase in AUC(∞u) (AUC(∞) × % drug unbound). The percentage of carisbamate unbound to proteins did not change across the groups, suggesting the increases in AUC(∞) were due to decreased intrinsic hepatic clearance. Carisbamate 200 mg was well tolerated.
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