Drug interactions with quinolone antibacterials

Area of Science:

• Pharmacology
• Drug Interactions
• Antimicrobial Agents

Background:

• Quinolone antibacterials are frequently prescribed for bacterial infections.
• Numerous drug interactions have been reported with quinolone use.
• Understanding these interactions is crucial for patient safety and therapeutic efficacy.

Purpose of the Study:

• To review and summarize the known drug interactions associated with quinolone antibacterials.
• To highlight potential risks and clinical implications of these interactions.
• To provide guidance for healthcare professionals managing patients on quinolone therapy.

Main Methods:

• Literature review of studies on quinolone drug interactions.
• Analysis of pharmacokinetic and pharmacodynamic data.
• Identification of drugs that interact with quinolones, including antacids, metallic ions, and cytochrome P450 substrates.
• Evaluation of the clinical significance of reported interactions.

Main Results:

• Quinolone absorption is significantly reduced by antacids (aluminum, magnesium, calcium), sucralfate, iron, and zinc salts.
• Certain quinolones (e.g., ciprofloxacin, enoxacin, pefloxacin) inhibit the cytochrome P450 system, increasing toxicity of drugs like theophylline.
• Warfarin and cyclosporine pharmacokinetics are generally unaffected.
• Some quinolones may induce central nervous system adverse effects, potentiated by nonsteroidal anti-inflammatory drugs (NSAIDs).

Conclusions:

• Quinolone drug interactions are common and clinically significant.
• Reduced absorption and enhanced toxicity are primary concerns.
• Healthcare providers must carefully consider concomitant medications to avoid adverse events and ensure treatment success.