Clinical pharmacokinetics of antiepileptic drugs in paediatric patients. Part II. Phenytoin, carbamazepine, sulthiame, lamotrigine, vigabatrin, oxcarbazepine and felbamate

Clinical Pharmacokinetics
D BattinoG Avanzini

Abstract

This article is the second part of a review of the pharmacokinetics of antiepileptic drugs (AEDs) in paediatric patients. It reviews 139 papers published since 1969 on the pharmacokinetics of phenytoin, carbamazepine, sulthiame, lamotrigine (phenyltriazine), vigabatrin, oxcarbazepine and felbamate in this population. The pharmacokinetics of phenytoin are significantly affected by age. The terminal elimination half-life (t1/2z) is relatively long in neonates; it then decreases during the first postnatal month to lower values than in adults, and then progressively increases with age due to an age-dependent decrease in the metabolic rate. Rate of elimination is strongly dose-dependent at all ages. The combination of these factors makes it difficult to predict what plasma concentrations would result from dose per kilogram (dose/kg) adjustments in neonates and children, especially when phenytoin is coadministered with other liver enzyme-inducing drugs, such as phenobarbital and carbamazepine. The concentration of phenytoin in brain and other tissues depends on the unbound/total concentration ratio. For neonates this ratio is higher than that found in adults; it then decreases over the first 3 postnatal months to approach adult value...Continue Reading

Citations

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