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[Population pharmacokinetics of phenytoin in pediatric patients]
Jue Wang1, Wen-Quan Liang, Jiang-Jun Wu
1The Children's Hospital, College of Medical Sciences, Zhejiang University, Hangzhou 310003, China.
Insights
This study analyzed phenytoin pharmacokinetics in pediatric epilepsy patients using sparse data. Phenytoin dosing may need adjustment when coadministered with phenobarbital or clonazepam.
Area of Science:
- Pharmacology
- Pediatric Medicine
- Epilepsy Treatment
Context:
- Population pharmacokinetics are crucial for optimizing drug therapy in children.
- Sparse data from therapeutic drug monitoring is a valuable resource for pharmacokinetic studies.
- Understanding phenytoin pharmacokinetics in pediatric epilepsy is essential for effective seizure control.
Purpose:
- To characterize the population pharmacokinetics of phenytoin in pediatric patients.
- To assess the impact of coadministered drugs (phenobarbital, clonazepam) on phenytoin pharmacokinetics.
- To utilize sparse data for estimating pharmacokinetic parameters in children.
Summary:
- Population pharmacokinetic parameters (Vm, Km) for phenytoin were determined in pediatric epilepsy patients.
- Two groups were analyzed: phenytoin monotherapy and coadministration with phenobarbital or clonazepam.
- Results showed Vm and Km values of 9.8 mg.kg(-1).d(-1) and 2.73 mg/L for the phenytoin group, and 9.2 mg.kg(-1).d(-1) and 3.24 mg/L for the coadministration group.
Impact:
- Coadministration of phenobarbital or clonazepam significantly alters phenytoin pharmacokinetics in children.
- The developed population pharmacokinetic model can aid in individualizing phenytoin dosage regimens.
- This research provides a foundation for improved phenytoin therapy management in pediatric epilepsy.
Objective:
To study population pharmacokinetics of phenytoin in pediatric patients by using sparse data.
Methods:
We used routinely collected therapeutic drug monitoring data, derived from the steady state serum concentrations of phenytoin in 42 pediatric outpatients with epilepsy. Depending on whether the patients were administered with phenytoin alone or coadministered with phenobabital or clonazepam, the subjects were divided into two groups: phenytoin group and coadministration group. The population parameter and individual parameter of phenytoin in children were estimated using Monte Carlo method.
Results:
The children's phenytoin population pharmacokinetic parameters Vm and Km were 9.8 mg.kg(-1).d(-1) and 2.73 mg/L in phenytoin group; and 9.2 mg.kg(-1).d(-1) and 3.24 mg/L in coadministration group. There were good relationship between predicted and determined concentrations with correlation coefficient of 0.999 and 0.984, respectively.
Conclusion:
The coadministration of phenobarbital or clonazepam obviously affected the pharmacokinetics of phenytoin. The population pharmacokinetics of phenytoin in children may provide a usefull index for individualization of dosage regimen.