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• W2021871876 abstract "Valproate exhibits a complex pharmacokinetic profile due to concentration-dependent protein binding and clearance. It has been shown that the protein binding of valproate decreases as the serum concentration increases in a young adult population. Furthermore, the percentage of protein binding is lower in the elderly compared with young adults at comparable low therapeutic serum concentrations. The extent of valproate protein binding at higher concentrations in the elderly has not been described. Studies conducted in the elderly have found unbound valproate clearance to be decreased compared with younger adults, although these changes in clearance have not been evaluated at higher therapeutic serum concentrations. We evaluated the pharmacokinetics of valproate (protein binding and clearance) across a wide dosage range in the elderly and measured the impact of this on drug-related side effects using a single-blind within-subject study design in 6 healthy elderly volunteers (aged 65-76 years). Steady-state total and unbound serum valproate concentrations were assessed at 3 doses: 500, 1000, and 1500 mg/d. As doses and valproate serum concentrations increased, the unbound fraction (10.0%, 13.0%, 17.4%) and total clearance (4.8, 6.0, 6.7 mL/h/kg) increased, respectively. Unbound clearance decreased (49.4, 45.8, 39.4 mL/h/kg) with increasing valproate serum concentrations. Drug-induced CNS effects and nausea severity scores correlated with total and unbound serum valproate concentrations. Significant dose-dependent changes in valproate pharmacokinetics were observed in the elderly." @default.
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• W2021871876 date "2003-10-01" @default.
• W2021871876 modified "2023-10-14" @default.
• W2021871876 title "Dose-Related Pharmacokinetics and Pharmacodynamics of Valproate in the Elderly" @default.
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• W2021871876 doi "https://doi.org/10.1097/01.jcp.0000088903.24613.2a" @default.
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