title: Mechanism of renal excretion of FK027 in dogs and rabbits.
abstract: The mechanism of renal excretion of FK027, a new oral cephalosporin, was investigated in dogs and rabbits. In dogs, FK027 was mainly cleared by glomerular filtration, and approximately 50% of the filtered drug was reabsorbed through the proximal tubules. This tubular reabsorption and a high binding ratio to serum protein lead to the exceptionally long serum half-life of the drug. The facts that the clearance ratio of FK027 declined slightly from 58.0 to 49.2% by the addition of probenecid, and that the effect of probenecid was less marked in the stop-flow study, along with no significant change in serum half-life, may account for the scarcely detectable secretion from the renal tubules. In rabbits, the addition of probenecid caused a decrease of the clearance ratio of FK027, disappearance of FK027 peak in the stop-flow study, and extended the serum half-life. These facts are evidence that FK027 is excreted by both tubular secretion and glomerular filtration in rabbits.
mesh_terms: D000042:Absorption; D000818:Animals; D020682:Cefixime; D002439:Cefotaxime / Q000031:analogs & derivatives* / Q000378:metabolism; D004285:Dogs; D007668:Kidney / Q000378:metabolism*; D008297:Male; D008657:Metabolic Clearance Rate; D011339:Probenecid / Q000494:pharmacology; D011817:Rabbits; D013045:Species Specificity; D010130:p-Aminohippuric Acid / Q000378:metabolism
chemical_list: D020682:Cefixime; D002439:Cefotaxime; D011339:Probenecid; D010130:p-Aminohippuric Acid