Abstract
To characterize the effect of orally administered probenecid on the pharmacokinetics of cefoxitin in healthy male volunteers, we administered to one group of six subjects 2 g of cefoxitin by intravenous (i.v.) bolus either alone, with 1 g of probenecid concomitantly, or when 1 g of probenecid was administered 1 h previously by using a crossover design. Likewise, we administered to a second group of six subjects 2 g of cefoxitin intramuscularly (i.m.) together with 1 and 2 g of probenecid. Probenecid increased the mean terminal half-life and the area under the serum cefoxitin concentration-time curve (AUC0-24) and decreased renal clearance, but did not alter the volume of the central compartment or the total urinary recovery of i.v.-administered cefoxitin; pretreatment with probenecid produced a greater increase in cefoxitin AUC0-24 and a constant decrease in renal clearance compared to concomitant probenecid. The AUC0-24 after i.m.-administered cefoxitin was greater after 2 g than 1 g of probenecid; the AUC0-24 after i.v.-and i.m.-administered cefoxitin was similar after 1 g of probenecid was given concomitantly. Cefoxitin AUC0-24 was increased further when 1 g of probenecid was given before i.v.-administered cefoxitin or when 2 g of probenecid was given with i.m.-administered cefoxitin. The effect of probenecid was related to both timing and dose.
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Selected References
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