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Chronopharmacology of furosemide in rats with amikacin-induced acute renal damage.

To examine the influence of amikacin-induced acute renal damage on the urinary excretion of furosemide and the time-dependent variation in the urinary amount of the agent, amikacin (1.2 g/kg) was given intraperitoneally to Wistar rats. Study I: Three percent b.w. of 1% NaCl solution was given orally before and after amikacin treatment, and an 8-hour urine for N-acetyl-beta-D-glucosaminidase (NAG) was collected. Study II: Furosemide (30 mg/kg) in 3% b.w. of 1% NaCl solution was given orally at 12 a.m. or 12 p.m. before and after amikacin treatment, and an 8-hour urine for sodium and furosemide was collected. Following amikacin treatment, urinary excretion of NAG increased, while urine volume and urinary excretion of sodium and furosemide decreased. Urinary excretion of furosemide and its diuretic effects were significantly greater at 12 a.m. than at 12 p.m. before and after treatment. However the time-dependent differences in these parameters were diminished by amikacin treatment. These results suggest that the urinary excretion of furosemide is reduced and the extents of the time-dependent variation in the urinary furosemide and its diuretic effects are altered in rats with amikacin-induced renal damage.