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Metabolism and the fluoroquinolones.
1School of Pharmacy, University of Connecticut, Storrs.
The American Journal of Medicine
|December 29, 1989
Summary
Fluoroquinolone metabolism varies significantly, impacting drug interactions and selection. Understanding these differences in liver biotransformation is key for effective antibiotic use.
Area of Science:
- Pharmacology
- Drug Metabolism
- Microbiology
Background:
- Quinolones exhibit diverse nonrenal elimination pathways.
- Hepatic biotransformation is a significant factor in fluoroquinolone pharmacokinetics.
Purpose of the Study:
- To investigate the varying extent of fluoroquinolone metabolism in the liver.
- To understand the implications of quinolone metabolism on drug interactions and selection.
Main Methods:
- Analysis of fluoroquinolone biotransformation pathways.
- Identification of major metabolites, including oxoquinolone.
- Assessment of cytochrome P-450 mediated oxidative metabolism.
Main Results:
- Hepatic metabolism of fluoroquinolones ranges from 6% (ofloxacin) to 50% (pefloxacin).
- Metabolism primarily occurs via cytochrome P-450 oxidative mechanisms, altering the piperazinyl moiety.
- Oxoquinolone metabolite formation varies, except in ofloxacin, and correlates with drug interactions (e.g., theophylline, caffeine).
Conclusions:
- Significant inter-agent variability in quinolone metabolism influences their pharmacokinetic profiles.
- Metabolism-related drug interactions are a critical consideration for fluoroquinolone therapy.
- The degree and type of metabolism are important factors in selecting quinolones for patient treatment and formulary inclusion.