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Levofloxacin pharmacokinetics in children
Shuchean Chien1, Thomas G Wells, Jeffrey L Blumer
1Johnson & Johnson Pharmaceutical Research & Development, LLC, 920 Route 202 South, PO Box 300, Raritan, NJ 08869-0602, USA.
Journal of Clinical Pharmacology
|January 14, 2005
Summary
Pediatric levofloxacin dosing requires age-specific adjustments. Children under 5 clear the antibiotic faster, necessitating a higher frequency, while older children can receive a standard daily dose for effective treatment.
Area of Science:
- Pharmacology
- Pediatric Infectious Diseases
- Clinical Pharmacokinetics
Background:
- Levofloxacin is a critical antibiotic for pediatric bacterial infections, including those caused by resistant pathogens.
- Establishing appropriate pediatric dosing is essential for ensuring therapeutic efficacy and safety.
Purpose of the Study:
- To determine levofloxacin pharmacokinetic parameters in children across different age groups.
- To develop age-specific dosing recommendations for pediatric patients.
Main Methods:
- Conducted three multicenter pharmacokinetic studies involving 85 children aged 6 months to 16 years.
- Administered single 7-mg/kg doses (IV or oral) and collected plasma/urine samples over 24 hours.
- Compared pharmacokinetic parameters (Cmax, tmax, t1/2, clearance, AUC) across age groups and to adult data.
Main Results:
- Levofloxacin absorption and distribution are similar in children and adults and not age-dependent.
- Levofloxacin elimination is age-dependent; children under 5 years clear the drug approximately twice as fast as adults.
- Children under 5 have about half the systemic exposure (AUC) compared to adults.
Conclusions:
- Children aged 5 years and older require a daily dose of 10 mg/kg for comparable exposure to adults.
- Children aged 6 months to under 5 years need 10 mg/kg every 12 hours to achieve similar levofloxacin exposure.
- Age-specific dosing is crucial for optimizing levofloxacin therapy in pediatric populations.