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Effect of miocamycin on theophylline kinetics in children
Insights
This study found that miocamycin does not affect theophylline pharmacokinetics in children with asthma. Asthmatic children can safely take miocamycin with theophylline when needed for infections.
Area of Science:
- Pharmacology
- Pediatric Medicine
- Infectious Diseases
Background:
- Theophylline is a common asthma medication.
- Macrolide antibiotics are used for infections.
- Drug interactions between antibiotics and theophylline require evaluation.
Purpose of the Study:
- To assess the pharmacokinetic interaction between miocamycin and theophylline in pediatric asthma patients.
- To determine if miocamycin alters theophylline metabolism or clearance.
Main Methods:
- A single cross-over study design was used.
- Five asthmatic children received theophylline before and after a 10-day course of miocamycin.
- Theophylline pharmacokinetics, including elimination rate constant, total body clearance, and volume of distribution, were measured.
Main Results:
- No significant differences were observed in the elimination rate constant, total body clearance, or apparent volume of distribution of theophylline.
- Miocamycin did not form inactive cytochrome P-450 metabolite complexes that interfere with theophylline metabolism.
Conclusions:
- Miocamycin can be safely co-administered with theophylline in asthmatic children.
- This combination is suitable for treating infections in pediatric asthma patients when pathogens are susceptible to miocamycin.
Abstract:
The interaction between a new macrolide antibiotic, miocamycin, and theophylline was evaluated in a single cross-over study in 5 asthmatic children. Each patient received a single dose of theophylline (4.3 mg/kg) delivered in 15 min using a constant-rate infusion pump, immediately before and after a 10 day course of miocamycin 17.5 mg/kg b.d. The pharmacokinetics of theophylline were calculated for each phase of the study. The elimination rate constant (3.92 vs 3.74 h-1), the mean total body clearance (1.71 vs 1.8 ml X min X kg-1) and the mean apparent volume of distribution (0.57 vs 0.581 X kg-1) did not differ. The result can be explained by the inability of the antibiotic to form inactive cytochrome P-450 metabolite complexes which can interfere with the metabolism of theophylline. Thus, miocamycin can safely be administered to asthmatic children requiring theophylline treatment, when they have an infection due to susceptible pathogens.