[Animal experiments on the nephrotoxicity, pharmacokinetics and therapeutic efficacy of dibekacin]

Nephrotoxicity, pharmacokinetics, and therapeutic efficacy of 3',4'-dideoxykanamycin (dibekacin), a semisynthetic aminoglycoside, were evaluated in rats. As with other aminoglycosides, therapy with dibekacin led to an increased urinary cell and malic-dehydrogenase excretion. The lowest dose resulting in an increased urinary cell excretion was 2.5 mg/kg/d. Serum levels of dibekacin after i.m. injection of 5 mg/kg were similar to those of other aminoglycosides. The kidneys accumulated high amounts of dibekacin, and eliminated it with a half-life of about 7 days. After repetitive dosing a distinct tendency to accumulation (highest renal concentration: 330 microgram/g) could be detected. Experimental chemotherapy of the chronic estrogen induced pyelonephritis revealed that dibekacin and sisomicin fed to significant reductions of renal bacterial counts at a dosage of 2 x 5 mg/kg/d for 7 days. A dosage of 2 x 2.5 mg/kg/d diminished the effectiveness of dibekacin distinctly, that of sisomicin only slightly.