Pharmacokinetics of Valproic Acid in Epilepsy Treatment
Summary
Valproic acid (VPA) is a branched‐chain fatty acid widely used as an antiepileptic agent. Oral administration achieves near‐complete bioavailability, and absorption is rapid with peak plasma concentrations reached within one to four hours. VPA exhibits extensive plasma protein binding, which is saturable at higher concentrations, leading to a non‐linear increase in free drug fraction. The volume of distribution is relatively large, reflecting penetration into tissues, including the central nervous system. Hepatic metabolism predominates via glucuronidation, mitochondrial β‐oxidation and cytochrome P450–mediated oxidation; metabolites contribute variably to therapeutic and toxic effects. Clearance varies markedly with age, weight, comedications and genetic polymorphisms in metabolic enzymes, necessitating therapeutic drug monitoring to maintain efficacy while minimising adverse events such as hepatotoxicity, thrombocytopenia and hyperammonaemia. Advances in population pharmacokinetic modelling and machine learning are refining dose individualisation and predicting serum concentrations, with the goal of improving global treatment outcomes and patient safety.
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Pharmacokinetics of Valproic Acid in Epilepsy Treatment publication trend
The graph below shows the total number of articles in pharmacokinetics of valproic acid in epilepsy treatment across all publications each year (not limited to Nature Index journals).
Technical terms
Bioavailability: Proportion of an administered dose that reaches systemic circulation intact.
Clearance: Volume of plasma from which a substance is completely removed per unit time.
Volume of distribution: Hypothetical volume that relates drug amount to plasma concentration.
Protein binding: Reversible association of drug molecules with plasma proteins, affecting free concentration.
Free concentration: Unbound fraction of drug in plasma responsible for pharmacological and toxic effects.
Therapeutic drug monitoring: Measurement of drug levels to guide dose adjustments and ensure safety.
Population pharmacokinetic (popPK) model: Mathematical description of drug concentration variability across individuals based on covariates.
Bayesian forecasting: Statistical method combining prior data and new measurements to predict individual pharmacokinetic parameters.
References
- Valproic acid monitoring: Serum prediction using a machine learning framework from multicenter real-world data. Journal of Affective Disorders (2023).
- Modeling the protein binding non-linearity in population pharmacokinetic model of valproic acid in children with epilepsy: a systematic evaluation study. Frontiers in Pharmacology (2023).
- Molecular and Therapeutic Potential and Toxicity of Valproic Acid. BioMed Research International (2010).
- Therapeutic and Toxic Effects of Valproic Acid Metabolites. Metabolites (2023).
- Safety range of free valproic acid serum concentration in adult patients. PLOS ONE (2020).
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