Drug-drug interactions with fluoroquinolones

Area of Science:

• Pharmacology
• Drug Interactions
• Antimicrobial Agents

Background:

• Fluoroquinolones are a class of antimicrobials with significant clinical importance.
• Several drug-drug interactions involving fluoroquinolones have been documented.
• These interactions can vary in occurrence and severity among different fluoroquinolone agents and patients.

Purpose of the Study:

• To review and summarize clinically important drug-drug interactions associated with fluoroquinolones.
• To highlight interactions affecting oral absorption and drug metabolism.
• To inform clinicians about potential interactions for optimal fluoroquinolone use.

Main Methods:

• Literature review of documented fluoroquinolone drug-drug interactions.
• Analysis of interactions based on affected pharmacokinetic processes (absorption, metabolism).
• Categorization of interactions by fluoroquinolone agent specificity and interpatient variability.

Main Results:

• Oral absorption of all fluoroquinolones is significantly reduced by antacids, sucralfate, and metal cations (calcium, iron).
• Enoxacin and ciprofloxacin notably inhibit the hepatic metabolism of theophylline and caffeine, increasing serum concentrations.
• Ofloxacin and lomefloxacin show minimal impact on xanthine metabolism; warfarin interaction remains uncertain despite case reports.

Conclusions:

• Clinicians must be aware of fluoroquinolone drug-drug interactions to ensure safe and effective prescribing.
• Interactions affecting absorption (e.g., with antacids) and metabolism (e.g., with theophylline) are clinically relevant.
• Careful patient management and consideration of coadministered medications are essential for optimal fluoroquinolone therapy.