The absorption of antibiotics from the bladder

Area of Science:

• Pharmacology
• Urology
• Nephrology

Background:

• Antibiotic irrigation of the bladder is a common postoperative practice.
• Concerns exist regarding systemic absorption and potential toxicity of antibiotics used in bladder irrigation.

Purpose of the Study:

• To investigate the systemic absorption of polymyxin B, bacitracin, and neomycin following intravesical administration in humans.
• To determine the extent of antibiotic movement across the bladder epithelium into systemic circulation.

Main Methods:

• Human subjects undergoing postoperative bladder irrigation.
• Analysis of systemic blood samples for the presence of polymyxin B, bacitracin, and neomycin.

Main Results:

• No significant levels of polymyxin B were detected in the systemic circulation.
• Bacitracin and neomycin also demonstrated negligible systemic absorption via this route.
• The bladder epithelium appears to act as an effective barrier against systemic antibiotic entry.

Conclusions:

• Intravesical irrigation with polymyxin B, bacitracin, and neomycin is unlikely to cause systemic toxicity due to minimal absorption.
• This route of administration is generally safe for systemic exposure.
• Further studies could explore optimal dosing and duration for localized effect.