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Population Pharmacokinetics and Dosing Optimization of Amoxicillin in Neonates and Young Infants

Bo-Hao Tang1, Yue-E Wu1, Chen Kou2

  • 1Department of Clinical Pharmacy, School of Pharmaceutical Sciences, Shandong University, Jinan, China.

Antimicrobial Agents and Chemotherapy
|December 5, 2018
PubMed

Insights

This study established evidence-based amoxicillin dosage regimens for neonates and young infants. New dosing recommendations ensure optimal treatment of bacterial infections by considering developmental pharmacokinetics and pharmacodynamics.

Area of Science:

  • Pharmacology
  • Neonatal Medicine
  • Infectious Diseases

Background:

  • Amoxicillin is a key antibiotic for neonatal bacterial infections.
  • Significant variability exists in current amoxicillin dosing regimens for neonates.
  • Limited pharmacokinetic data is available for preterm neonates.

Purpose of the Study:

  • To evaluate population pharmacokinetics of amoxicillin in a large cohort of neonates and young infants.
  • To develop evidence-based amoxicillin dosage regimens using developmental pharmacokinetics-pharmacodynamics.
  • To optimize antibiotic therapy for neonatal bacterial infections.

Main Methods:

  • Prospective, multicenter pharmacokinetic study with opportunistic sampling.
  • Amoxicillin plasma concentrations measured by high-performance liquid chromatography.
  • Population pharmacokinetic analysis using NONMEM, with covariate analysis and model validation.

Main Results:

  • A two-compartment model identified current weight, postnatal age, and gestational age as significant covariates.
  • Simulations showed current regimens achieve pharmacodynamic targets in 79.0%-99.0% of neonates, depending on sepsis type and prematurity.
  • Established new dosage regimens based on developmental pharmacokinetics-pharmacodynamics.

Conclusions:

  • Population pharmacokinetics of amoxicillin in neonates and young infants were characterized.
  • Evidence-based amoxicillin dosage regimens were established for improved neonatal infection treatment.
  • Optimized dosing can enhance therapeutic outcomes and minimize resistance.

Keywords:
amoxicillindosing optimizationneonatespharmacokinetics

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