Abstract
Diuretics and antibiotics are frequently used concomitantly. The possibility of drug interactions led us to study the effects of several diuretics on the renal elimination of cephalothin. Five healthy volunteers received a constant infusion of 500 mg of sodium cephalothin per h for 9 h on 4 consecutive days. Each day, after the third hour of infusion, the subjects were given one of the following in varying order: (i) furosemide (1 mg/kg, intravenous), (ii) mercaptomerin (250 mg, intramuscular), (iii) mannitol (25 g, intravenous), or (iv) no diuretic (control day). Fluid losses were replaced hourly. Serum and complete urine collections were obtained each hour and assayed for creatinine and cephalothin (bioassay). Clearances (milliliter per minute) and urinary excretions (milligram per hour) of cephalothin did not differ either when the diuretic day values were compared with control day, or when pre- and postdiuretic results on the same day were compared. Creatinine clearances were not affected by diuretics except for a transient rise after furosemide.
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