Batchelor, Hannah, Appleton, Richard and Hawcutt, Daniel B 
ORCID: 0000-0002-8120-6507
(2015)
Comparing paediatric intravenous phenytoin doses using physiologically based pharmacokinetic (PBPK) modelling software.
SEIZURE-EUROPEAN JOURNAL OF EPILEPSY, 33.
pp. 8-12.
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Abstract
<h4>Purpose</h4>To use a physiologically based pharmacokinetic (PBPK) modelling system to predict the serum levels achieved by two different intravenous loading doses of phenytoin.<h4>Methods</h4>A phenytoin pharmacokinetic model was used in the Simcyp population-based ADME simulator, simulating 100 children age 2-10 years receiving intravenous phenytoin (18 and 20mg/kg). Visual checks were used to evaluate the predictive performance of the candidate model.<h4>Results</h4>Loading with doses of 18 mg/kg, blood levels were sub-therapeutic in 22/100 (concentration at 2h post infusion (C2h) <10 μg/mL), therapeutic in 62/100 (C2h 10-20 μg/mL), and supra-therapeutic in 16/100 (C2h>20 μg/mL). Loading with 20mg/kg, the percentages were 15, 59, and 26, respectively. Increasing from 18 to 20 mg/kg increased the mean C2h from 16.0 to 17.9 μg/mL, and the mean AUC from 145 to 162 μg/mL/h. A C2h>30 μg/mL was predicted in 4% and 8% of children in the 18 and 20 mg/kg doses, with 3% predicted to have a C2h>40 μg/mL following either dose. For maintenance doses, a 1st dose of 2.5 or 5mg/kg (intravenous) given at 12h (after either 18 or 20 mg/kg loading) gives the highest percentages of 10-20 μg/mL serum concentrations. For sub-therapeutic concentrations following intravenous loading (20 mg/kg), a 1st maintenance dose (intravenous) of 10mg/kg will achieve therapeutic concentrations in 93%.<h4>Conclusion</h4>Use of PBPK modelling suggests that children receiving the 20 mg/kg intravenous loading dose are at slightly increased risk of supra-therapeutic blood levels. Ideally, therapeutic drug monitoring is required to monitor serum concentrations, although the dose regime suggested by the BNFc appear appropriate.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Pharmacokinetics, Phenytoin, Paediatric, PBPK modelling |
| Subjects: | ?? RJ ?? ?? RM ?? |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 13 Jan 2016 10:45 |
| Last Modified: | 15 Dec 2022 12:06 |
| DOI: | 10.1016/j.seizure.2015.10.006 |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/2042299 |
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