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Kinetics of placentally transferred phenytoin and its p‐hydroxylated metabolites in newborn infants.

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1 The kinetics of phenytoin and its main metabolites, unconjugated and conjugated 4‐hydroxy‐phenytoin were studied in newborn infants of epileptic mothers that were treated with phenytoin during the pregnancy. 2 In two of the infants phenytoin was eliminated by an apparent zero‐order process followed by an apparent first‐order process. In the other two infants the mode of elimination could not be characterized. 3 The decline of plasma conjugated 4‐hydroxy‐phenytoin was parallel to that of phenytoin. In contrast, the plasma concentration of unconjugated 4‐hydroxy‐phenytoin remained grossly constant during the first 3 to 4 days.
Title: Kinetics of placentally transferred phenytoin and its p‐hydroxylated metabolites in newborn infants.
Description:
1 The kinetics of phenytoin and its main metabolites, unconjugated and conjugated 4‐hydroxy‐phenytoin were studied in newborn infants of epileptic mothers that were treated with phenytoin during the pregnancy.
2 In two of the infants phenytoin was eliminated by an apparent zero‐order process followed by an apparent first‐order process.
In the other two infants the mode of elimination could not be characterized.
3 The decline of plasma conjugated 4‐hydroxy‐phenytoin was parallel to that of phenytoin.
In contrast, the plasma concentration of unconjugated 4‐hydroxy‐phenytoin remained grossly constant during the first 3 to 4 days.

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