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Linezolid pharmacokinetics in pediatric patients: an overview

Gail L Jungbluth1, Ian R Welshman, Nancy K Hopkins

  • 1Clinical Pharmacology Unit, Pharmacia Corp., Kalamazoo, MI, USA

The Pediatric Infectious Disease Journal
|October 2, 2003
PubMed

Insights

Pediatric linezolid dosing requires age-specific adjustments due to significant pharmacokinetic differences. Children under 12 need shorter dosing intervals for effective drug exposure against Gram-positive pathogens.

Area of Science:

  • Pharmacology
  • Pediatric Therapeutics
  • Drug Metabolism

Background:

  • Physiologic and developmental differences in children impact drug pharmacokinetics (absorption, distribution, metabolism, elimination).
  • Establishing pediatric-specific pharmacokinetic data is crucial for developing safe and effective age-appropriate drug dosages.
  • This review focuses on linezolid pharmacokinetics in pediatric patients and the basis for its approved dosing.

Purpose of the Study:

  • To summarize linezolid's pharmacokinetic parameters in pediatric patients.
  • To provide the rationale for current linezolid dosing recommendations in children.
  • To highlight age-dependent variations in linezolid's drug exposure.

Main Methods:

  • Evaluated linezolid pharmacokinetics in over 180 pediatric patients (preterm infants to 18 years) across 4 clinical trials.
  • Administered single intravenous doses of linezolid to all study participants.
  • Quantified plasma linezolid concentrations using validated high-performance liquid chromatography or liquid chromatography/mass spectrometry/mass spectrometry methods.

Main Results:

  • Linezolid's elimination clearance is significantly age-dependent in pediatric populations.
  • Children under 12 exhibit a smaller area under the curve, faster clearance, and shorter half-life compared to adults.
  • Newborns show adult-like clearance, which rapidly increases within the first week of life, becoming 2-3 times higher than adults by day seven.

Conclusions:

  • Higher clearance and lower area under the curve in children under 12 necessitate shorter linezolid dosing intervals.
  • Age-specific dosing ensures adequate drug exposure to combat target Gram-positive pathogens in pediatric patients.
  • Linezolid pharmacokinetics in children aged 12 and older are comparable to adult values, suggesting similar dosing may be appropriate.
Abstract

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