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Gentamicin kinetics in the neonate.

J C Miranda, M M Schimmel, L S James

    Pediatric Pharmacology (New York, N.Y.)
    |January 1, 1985
    PubMed
    Summary

    Gentamicin elimination half-life in neonates is linked to postconceptual age. Infants under 34 weeks may accumulate gentamicin, necessitating extended dosing intervals and close monitoring to prevent nephrotoxicity.

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    Area of Science:

    • Neonatal Pharmacology
    • Pediatric Nephrology
    • Pharmacokinetics

    Background:

    • Gentamicin is a critical antibiotic for neonatal infections.
    • Accurate dosing is essential due to narrow therapeutic windows and potential toxicity.
    • Neonatal physiology significantly impacts drug elimination.

    Purpose of the Study:

    • To determine gentamicin elimination half-life in neonates.
    • To investigate the relationship between postconceptual age and gentamicin pharmacokinetics.
    • To assess the risk of gentamicin accumulation and nephrotoxicity in neonates.

    Main Methods:

    • Serum gentamicin levels were measured in neonates (25-42 weeks postconceptual age).
    • Elimination half-life (t 1/2e) was calculated using a one-compartment open model.
    • Intravenous gentamicin was administered at various dosage intervals (2.5 mg/Kg/dose).

    Main Results:

    • Gentamicin accumulation was observed in 82% of infants younger than 34 weeks.
    • Elimination half-life was longest in infants younger than 30 weeks (8.8 ± 0.7 hours).
    • Half-life decreased with increasing postconceptual age, being shortest in infants >34 weeks (6.2 ± 0.5 hours).

    Conclusions:

    • Gentamicin elimination is significantly influenced by postconceptual age in neonates.
    • Current recommended dosing may lead to gentamicin accumulation and nephrotoxicity in premature infants.
    • Lengthening the gentamicin dosage interval to 18 hours for infants <34 weeks, with plasma level monitoring, is recommended.

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