Ciprofloxacin penetration into extravascular spaces in a rabbit model

Area of Science:

• Pharmacology
• Microbiology
• Drug Distribution Studies

Background:

• Ciprofloxacin is a potent fluoroquinolone antibiotic.
• Understanding drug penetration into extravascular tissues is crucial for optimizing antimicrobial therapy.
• The Visking chamber model allows for the study of drug diffusion into interstitial spaces.

Purpose of the Study:

• To investigate the penetration of ciprofloxacin into extravascular spaces.
• To quantify the ratio of extravascular to serum drug concentrations.
• To assess the distribution characteristics of ciprofloxacin in an animal model.

Main Methods:

• A rabbit Visking chamber model was utilized.
• Ciprofloxacin was administered intramuscularly at 7 mg/kg every 4 hours for eight doses.
• Serum and extravascular fluid drug levels were measured at peak and trough after the eighth dose.

Main Results:

• Peak serum ciprofloxacin levels were 1.3 µg/ml and trough levels were 0.35 µg/ml.
• Peak extravascular levels were 0.61 µg/ml and trough levels were 0.50 µg/ml.
• The ratio of extravascular to serum free drug area under the curve was 91.1% by dose 8.

Conclusions:

• Ciprofloxacin demonstrates significant penetration into extravascular spaces.
• The drug exhibits favorable distribution into tissues, suggesting potential for treating infections in these sites.
• This study supports the efficacy of ciprofloxacin in reaching target areas for antimicrobial action.