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-Technical imidacloprid was evaluated for its effect on oxidative stress and Lipid peroxidation (LPO) in female rats for No Observed Effect Level (NOEL). Activities of Superoxide dismutase (SOD), Catalase (CAT), Glutathione peroxidase (GPx), and level of Glutathione (GSH) and LPO were estimated in liver, kidney and brain of rats after oral administration of imidacloprid (5, 10, 20 mg/kg/day) for 90 days. Imidacloprid at 5 and 10 mg/kg/day has not produced changes in SOD, CAT, GPx and level of GSH and LPO in liver, brain and kidney. However 20 mg/kg/day has produced significant changes in SOD, CAT, GPx, GSH, LPO in liver; SOD, CAT and GPx in brain and LPO in kidney. Therefore, it is concluded that imidacloprid has not generated oxidative stress at 5 and 10mg/kg/day but induced changes at 20 mg/kg/day. Hence 10 mg/kg/day may be considered as NOEL through antioxidant enzymes and LPO in female rats.