Deltamethrin toxicity was studied in broilers and vitamin E was evaluated for therapeutic management. Day old male broiler chicks were randomly divided into 3 groups consisting of 6 chicks in each. Group 1 was maintained as control for 6 wks, group 2 was fed on deltamethrin (100 mg/kg feed) for 6 wks and group 3 was fed on deltamethrin for the first 4 wks and during the subsequent 2 wks with vitamin E (300 mg/kg feed) with out deltamethrin. Weekly body weights, feed conversion ratio, glutathione (GSH) concentration and high density lipoproteins (HDL) were significantly (P < 0.05) reduced, while the activities of glutathione peroxidase (GSH-Px), glutathione reductase (GSH-R), catalase, aspartate aminotransferase (AST) and lactate dehydrogenase (LDH), and the lipid profile and renal biomarkers were increased significantly (P < 0.05) in group 2 and 3 at the end of 4th wk as compared to group 1. Following treatment with vitamin E during the last 2 wks in group 3, all the parameters in study revealed improvement. From this study, it is concluded that deltamethrin induces toxicity by oxidative damage in biological system and supplementing vitamin E in feed is useful in treating accidental toxicity.