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Disposition kinetics of metronidazole in children
Insights
Metronidazole pharmacokinetics in children with infections were similar to adults. Saliva concentrations may offer a non-invasive method for monitoring metronidazole drug levels.
Area of Science:
- Pharmacology
- Pediatric Medicine
- Infectious Diseases
Background:
- Metronidazole is a crucial antibiotic for treating anaerobic bacterial infections and protozoal infections like trichomoniasis.
- Understanding metronidazole pharmacokinetics in pediatric populations is essential for optimizing treatment efficacy and safety.
- Previous studies have indicated potential differences in drug metabolism between children and adults.
Purpose of the Study:
- To investigate the pharmacokinetics of metronidazole in pediatric patients.
- To compare pediatric metronidazole pharmacokinetics with established adult data.
- To explore the potential of salivary metronidazole concentrations for non-invasive therapeutic drug monitoring.
Main Methods:
- A pharmacokinetic study involving 20 pediatric patients (aged 6 weeks to 14 years) with diagnosed trichomonal vaginitis or anaerobic bacterial infections.
- Oral administration of metronidazole at dosages of approximately 10 or 20 mg/kg twice daily (b.i.d.).
- Measurement of serum metronidazole concentrations and calculation of pharmacokinetic parameters; assessment of saliva metronidazole concentrations.
Main Results:
- Pediatric serum metronidazole concentrations and pharmacokinetic parameters were comparable to those observed in adults receiving weight-adjusted doses.
- Metronidazole demonstrated rapid diffusion into saliva, achieving a concentration ratio close to 1.0.
- These findings suggest similar drug exposure and disposition in children and adults.
Conclusions:
- Metronidazole exhibits predictable pharmacokinetics in pediatric patients, similar to adults on a weight-related dosage basis.
- Salivary metronidazole concentration monitoring presents a viable and non-invasive approach for assessing therapeutic drug levels in children.
- This study supports the use of metronidazole in pediatric populations and highlights a promising method for its monitoring.
Abstract:
The pharmacokinetics of metronidazole was studied in 20 paediatric patients aged 6 weeks and 4 to 14 years, who had trichomonal vaginitis or an anaerobic bacterial infection. The dosage of metronidazole was about 10 or 20 mg/kg b.i.d. orally. The serum concentrations found in children and the corresponding calculated kinetic parameters were similar to those in adults after intake of an equal, weight-related dose. Metronidazole shows rapid diffusion into the saliva with a concentration ratio of about 1.0. This can provide the basis for an efficient non-invasive method of drug monitoring.