Diabetes is the leading cause of chronic renal failure. Our purpose was to determine the effects of N-nitro-Larginine (L-NNA) and an extract of Stevia rebaudiana (Bertoni) (SrB) leaves on renal function in streptozotocin-nicotinamide (STZ-NA)-induced diabetic rats. Rats were divided into seven groups. Three of these groups were controls. Diabetes was induced by STZ-NA in the other four. Diabetic rats were treated with SrB (2001ng/kg), L-NNA (100 mg/kg), or SrB + L-NNA for 15 days after 5-8 v.1eeks of diabetes. At the end of the experiments, urine and blood samples were collected fron1 the rats, and kidney tissue samples 1vere collected v.1ith the ani1nals under ether anesthesia. Renal filtration changes were determined by measuing urine pH, urine volume, and serum and urine creatinine. Nitric oxide synthase (NOS) activity was measured in kidney homogenates. Alterations in kidney ultrastructure were determined by electron microscopy, and histological changes v.1ere examined by hematoxylin and eosin staining. No statistical differences were observed in urine creatinine or creatinine clearance. Even so, we observed higher NOS activity in SrB-treated diabetic rats. SrB-treated diabetic rats had less mitochondrial swelling and vacuolization in thin kidney sections than other diabetic groups. The control groups showed normal histological structure, whereas in the diabetic groups, membrane thickening, tubular epithelial cells, and cellular degeneration were observed. Thus, SrB has benef1cial effects on diabetes compared with L-NNA. Our results support the validity of SrB for the management of diabetes as well as diabetes-induced renal disorders.