[Enoxacin--comparative pharmacokinetics and tissue penetration]

Area of Science:

• Pharmacology
• Microbiology
• Drug Metabolism

Background:

• Antimicrobial agent selection relies on activity and host pharmacokinetics.
• Gyrase inhibitors exhibit varied antimicrobial spectra and pharmacokinetic profiles.

Purpose of the Study:

• To compare key pharmacokinetic parameters of major 4-quinolones.
• To elucidate differences in absorption, distribution, metabolism, and excretion (ADME) among these agents.

Main Methods:

• Comparative review of existing pharmacokinetic data for 4-quinolones.
• Analysis of absorption sensitivity to food and cations.
• Evaluation of tissue penetration using the Body Fluid Model.
• Assessment of elimination pathways (renal and hepatic) and drug interactions.

Main Results:

• Significant pharmacokinetic differences exist among 4-quinolones.
• Enoxacin demonstrates higher plasma levels and superior tissue penetration compared to ciprofloxacin and norfloxacin on a weight basis.
• Enoxacin is primarily renally eliminated (50-60%), with hepatic metabolism (12-15%).

Conclusions:

• Renal impairment necessitates enoxacin dose adjustments.
• Enoxacin's potential to inhibit other drug metabolism requires clinical consideration.
• Understanding these pharmacokinetic variations is crucial for optimizing 4-quinolone therapy.