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This study aimed to develop a population pharmacokinetic (PopPK) model for VPA in children with epilepsy and offer dose adjustment recommendation for switching dosage forms as needed. The study collected 1411 VPA steady\u2010state trough concentrations (<jats:italic>C<\/jats:italic><jats:sub>trough<\/jats:sub>) from 617 children with epilepsy. Using NONMEM software, a PopPK model was developed, employing a stepwise approach to identify possible variables such as demographic information and concomitant medications. The final model underwent internal and external evaluation via graphical and statistical methods. Moreover, Monte Carlo simulations were used to generate a dose tailoring strategy for typical patients weighting 20\u201350\u2009kg. As a result, the PK characteristics of VPA were described using a one\u2010compartment model with first\u2010order absorption. The absorption rate constant (<jats:italic>k<\/jats:italic><jats:sub>a<\/jats:sub>) was set at 2.64 and 0.46\u2009h<jats:sup>\u22121<\/jats:sup> for syrup and SR tablets. Body weight and sex were identified as significant factors affecting VPA's pharmacokinetics. The final PopPK model demonstrated acceptable prediction performance and stability during internal and external evaluation. For children taking syrup, a daily dose of 25\u2009mg\/kg resulted in the highest probability of achieving the desired target <jats:italic>C<\/jats:italic><jats:sub>trough<\/jats:sub>, while a dose of 20\u2009mg\/kg\/day was appropriate for those taking SR tablets. In conclusion, we established a PopPK model for VPA in children with epilepsy to tailor VPA dosage when switching between syrup and SR tablets, aiming to improve plasma VPA concentrations fluctuations.<\/jats:p>","DOI":"10.1002\/psp4.13191","type":"journal-article","created":{"date-parts":[[2024,6,25]],"date-time":"2024-06-25T06:06:13Z","timestamp":1719295573000},"page":"1554-1569","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Population pharmacokinetics of valproic acid in children with epilepsy: Implications for dose tailoring when switching from oral syrup to sustained\u2010release tablets"],"prefix":"10.1002","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-9863-0030","authenticated-orcid":false,"given":"Wei\u2010Jun","family":"Wang","sequence":"first","affiliation":[{"name":"Department of Pharmacy, Pharmaceutical Sciences Research Center Children's Hospital of Nanjing Medical University  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