Abstract
In female Sprague-Dawley rats, the renal clearance of cephaloridine decreased as the plasma concentration of the drug declined from above 10 micrograms/ml to below about 3 micrograms/ml, thus suggesting a saturable tubular reabsorption of cephaloridine similar to that shown previously in man. The effects of cephaloridine (250 mg/kg i.v.) were compared with those shown by a group of rats receiving saline and another group of rats receiving probenecid (250 mg/kg i.v.). Probenecid caused a sustained increase in the urate excretion rate. By contrast, cephaloridine produced a relatively small and transient increase in urate excretion, which may have been caused by its diuretic effect. Thus, it is unlikely that the reabsorption mechanism of urate is the principle mechanism by which cephaloridine is reabsorbed.
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