Abstract
The prevention and treatment of peritonitis in patients undergoing peritoneal dialysis is often complicated by several factors, including nephrotoxicity, requirement for hospitalization, parenteral antibiotic therapy, and infection caused by resistant microorganisms. Ciprofloxacin, a new carboxyquinolone derivative, may offer the advantages of oral administration, a broad spectrum of antibacterial activity, and safety for the management of these patients. The pharmacokinetics of ciprofloxacin in serum and peritoneal fluid of eight adult patients undergoing chronic ambulatory peritoneal dialysis (CAPD) were investigated. Each patient ingested a single 750-mg dose of ciprofloxacin, and drug concentrations were measured by high-pressure liquid chromatography in serum and peritoneal fluid for 48 h after the dose. Serum concentrations reached a mean peak of 3.6 micrograms/ml 1 to 2 h after the oral dose. The mean terminal serum half-life was 16.8 h, and the mean peritoneal fluid/serum concentration ratio was 0.64. The mean peak ciprofloxacin concentration in peritoneal fluid was 1.3 micrograms/ml, and the bioactivity of the drug in peritoneal fluid was confirmed. These data indicated that therapeutic concentrations of ciprofloxacin against bacterial pathogens commonly associated with peritonitis in CAPD patients may be achievable in the peritoneal fluid after oral administration to patients undergoing CAPD. In addition, the pharmacokinetic data provide guidelines for further clinical studies of oral ciprofloxacin in CAPD patients.
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