Population Pharmacokinetics of Valproic Acid in Pediatric and Adult Caucasian Patients

Population Pharmacokinetics of Valproic Acid in Pediatric and Adult Caucasian Patients

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(1) Background: The aim of this study was to explore the valproic acid (VPA) pharmacokinetic characteristics in a large population of Shirt pediatric and adult Caucasian patients and to establish a robust population pharmacokinetic (PopPK) model.(2) Methods: A total of 2527 serum VPA samples collected from 1204 patients included in a therapeutic drug monitoring program were retrospectively analyzed.Patients were randomly assigned to either a model development group or an external evaluation group.PopPK analysis was performed on 1751 samples from 776 patients with NONMEM using a nonlinear mixed-effect modelling approach.The influence of demographic, anthropometric, treatment and comedication variables on the apparent clearance (CL/F) of VPA was studied.

The bootstrap method was used to evaluate the final model internally.External evaluation was carried Corner Chair out using 776 VPA serum samples from 368 patients.(3) Results: A one-compartment model with first-order absorption and elimination successfully described the data.The final model included total body weight, age and comedication with phenytoin, phenobarbital and carbamazepine with a significant impact on VPA elimination.Internal and external evaluations demonstrated the good predictability of the model.

(4) Conclusions: A PopPK model of VPA in Caucasian patients was successfully established, which will be helpful for model-informed precision dosing approaches in clinical patient care.