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Pharmacokinetics of intravenous metronidazole in neonates

P Upadhyaya1, V Bhatnagar, N Basu

  • 1Department of Paediatric Surgery, All India Institute of Medical Sciences, New Delhi.

Journal of Pediatric Surgery
|March 1, 1988
PubMed

Insights

Neonates metabolize metronidazole differently than adults, with levels peaking by day three. This suggests potential adjustments in dosage or administration intervals for pediatric patients to ensure optimal anaerobic infection treatment.

Area of Science:

  • Pharmacology
  • Neonatal Medicine
  • Infectious Diseases

Background:

  • Metronidazole is a critical antibiotic for treating anaerobic infections in neonates.
  • Limited pharmacokinetic data exists for metronidazole in this vulnerable population.
  • Understanding drug handling is crucial for safe and effective neonatal care.

Purpose of the Study:

  • To investigate the pharmacokinetic profile of intravenous metronidazole in neonates.
  • To determine how metronidazole levels change over time and identify factors influencing them.
  • To compare neonatal pharmacokinetics with adult data to inform dosing strategies.

Main Methods:

  • Serial blood sampling was performed on thirty neonates receiving 7.5 mg/kg intravenous metronidazole every eight hours.
  • Drug concentrations were measured over the treatment course.
  • Patient age and clinical status (e.g., sepsis) were considered.

Main Results:

  • Metronidazole levels plateaued around the third day of treatment.
  • Younger neonates (<7 days) exhibited higher drug concentrations than older infants.
  • Septicemic neonates showed continuously increasing metronidazole levels, with a half-life of approximately 22.4 hours (twice that of adults).

Conclusions:

  • Neonatal pharmacokinetics of metronidazole differ significantly from adults.
  • Age and sepsis influence metronidazole accumulation in neonates.
  • Current dosing regimens may require modification (reduced dose or extended intervals) for neonates.

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