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Effect of age on ibuprofen pharmacokinetics and antipyretic response

R E Kauffman1, M V Nelson

  • 1Department of Pediatrics, Wayne State University School of Medicine, Detroit, MI.

The Journal of Pediatrics
|December 1, 1992
PubMed

Insights

Age did not affect ibuprofen pharmacokinetics, but younger children experienced earlier and greater fever reduction. This suggests body surface area influences antipyretic effectiveness in pediatric patients.

Area of Science:

  • Pediatric Pharmacology
  • Pharmacokinetics and Pharmacodynamics
  • Thermoregulation

Background:

  • Ibuprofen is commonly used for fever reduction in children.
  • Understanding age-related differences in drug response is crucial for optimizing pediatric treatment.
  • The relationship between ibuprofen concentration and its antipyretic effect in different age groups requires further elucidation.

Purpose of the Study:

  • To investigate the influence of age on ibuprofen pharmacokinetics and its antipyretic effects in infants and children.
  • To examine the correlation between plasma ibuprofen concentration and temperature reduction.
  • To determine if age impacts the absorption, elimination, or effect compartment dynamics of ibuprofen.

Main Methods:

  • Studied 49 children aged 3 months to 10.4 years.
  • Utilized iterative least squares to model drug concentration in an effect compartment.
  • Analyzed the relationship between plasma concentration and temperature decrement over time.

Main Results:

  • Age did not significantly alter ibuprofen absorption, plasma concentration, elimination rate, or effect compartment kinetics.
  • A 1-3 hour delay was observed between peak plasma concentration and maximum temperature reduction.
  • Younger children exhibited earlier onset, greater maximum antipyretic effect, and larger overall temperature reduction compared to older children.

Conclusions:

  • The enhanced antipyretic effect in younger children may be attributed to their greater relative body surface area, facilitating heat dissipation.
  • Hypothalamic temperature set-point changes induced by ibuprofen are effectively managed by younger children's physiology.
  • Findings suggest age-related physiological differences, not pharmacokinetic variations, drive differential ibuprofen antipyretic responses in pediatric populations.

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