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The effects of probenecid, an anion transport inhibitor, on the renal excretion mechanism of a new anionic carbapenem, DA-1131, were investigated after a 1-min intravenous infusion of DA-1131 at 100 mg/kg of body weight to rabbits and 50 mg/kg to rats with or without probenecid at 50 mg/kg for both species. In control rabbits, the renal clearance (CLR ) of DA-1131 and the glomerular filtration rate based on creatinine clearance (CLCR ) were 6.14 ± 2.09 and 2.26 ± 0.589 ml/min/kg, respectively. When considering the less than 10% plasma protein binding of DA-1131 in rabbits, renal tubular secretion of DA-1131 was observed in rabbits. The CLR of DA-1131 (3.87 ± 0.543 ml/min/kg) decreased significantly with treatment with probenecid in rabbits, indicating that the renal tubular secretion of DA-1131 was inhibited by probenecid. However, in control rats, the CLR of DA-1131 (5.80 ± 1.94 ml/min/kg) was comparable to the CLCR (4.29 ± 1.64 ml/min/kg), indicating that DA-1131 was mainly excreted by glomerular filtration in rats. Therefore, it could be expected that the CLR of DA-1131 could not be affected by treatment with probenecid in rats; this was proved by a similar CLR of DA-1131 with treatment with (6.93 ± 0.675 ml/min/kg) or without (5.80 ± 1.94 ml/min/kg) probenecid. Therefore, the renal secretion of DA-1131 is a factor in rabbits but is not a factor in rats.

Effect of Probenecid on the Renal Excretion Mechanism of a New Carbapenem, DA-1131, in Rats and Rabbits