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Pharmacokinetics in children

P A Routledge1

  • 1University of Wales College of Medicine, Heath Park, Cardiff, UK.

The Journal of Antimicrobial Chemotherapy
|August 1, 1994
PubMed
Summary
This summary is machine-generated.

Drug pharmacokinetics change significantly during the first year of life, impacting absorption, distribution, metabolism, and excretion. Understanding these developmental changes is crucial for safe and effective antibiotic prescribing in infants.

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Area of Science:

  • Neonatal pharmacology
  • Pediatric drug disposition

Background:

  • Infants undergo significant physiological changes impacting drug handling.
  • Drug absorption, distribution, metabolism, and excretion (ADME) processes mature post-birth.

Purpose of the Study:

  • To review the developmental changes in drug pharmacokinetics during the first year of life.
  • To highlight implications for antibiotic prescribing in neonates and infants.

Main Methods:

  • Literature review of pharmacokinetic changes in the first year of life.
  • Discussion of factors affecting oral, intramuscular, and transdermal drug absorption.
  • Analysis of changes in volume of distribution and protein binding.
  • Examination of developmental aspects of drug metabolism and renal excretion.

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Main Results:

  • Oral drug absorption is unreliable in neonates due to delayed gastric emptying.
  • Increased extracellular fluid and reduced protein binding increase drug volume of distribution.
  • Immature metabolic pathways and reduced renal excretion lead to prolonged drug half-lives.
  • Glomerular filtration and tubular secretion mature rapidly during infancy.

Conclusions:

  • Pharmacokinetic processes develop at varying rates in the first year of life.
  • Adjusting antibiotic doses based on developmental stage is critical.
  • Calculated glomerular filtration rate and therapeutic drug monitoring aid safe antibiotic use.