Pharmacokinetic studies of cefoxitin in continuous ambulatory peritoneal dialysis
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The pharmacokinetics of cefoxitin was examined in 9 patients undergoing peritoneal dialysis for chronic renal failure. Cefoxitin was administered intraperitoneally in the dialysate fluid every 6 h for 24 h, in two different concentrations, 50 µg/ml and 100 µg/ml.
The plasma half-life of cefoxitin was 20.2 h. The major route of elimination was non-renal, with a clearance of 8.0 ml/min. Peritoneal clearance was 4.1 ml/min. As expected, renal clearance was negligible.
The peak plasma concentrations of cefoxitin at the two dose levels used were 7 µg/ml and 15 µg/ml, respectively, when assayed by HPLC, and 12 µg/ml and 24 µg/ml when determined by a microbiological assay. The cefoxitin concentration in the dialysate decreased from 50 µg/ml to 14 µg/ml and from 100µg/ml to 37 µg/ml during the 6 h of its retention in the peritoneal cavity.
Key wordscefotoxin renal failure peritoneal dialysis pharmacokinetics CAPD (continuous ambulatory dialysis) dialysate concentration intra peritoneal administration
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