Abstract
To examine the nephrotoxicity of prolonged gentamicin administration compared to the effect obtained when a less toxic aminoglycoside is substituted during the course of treatment, we gave gentamicin (67.5 mg/kg per day) to rats for 21 days, gentamicin for 14 days followed by either netilmicin or tobramycin for 7 days, or gentamicin for 14 days followed by saline diluent. After initial tubular, necrosis, the animals recovered from renal injury whether the drug was continued or discontinued or another drug was substituted. These data are consistent with the observation that regenerating renal epithelium is resistant to continued or additional nephrotoxic insults. These findings suggest that improvement in renal function during aminoglycoside therapy cannot necessarily be attributed to the substitution of another aminoglycoside or other therapeutic interventions.
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