In present study the methanol extract of Cyperus tegetum rhizome (MECT) was evaluated for its effect on paracetamol-induced liver damage in Wistar rats. Serum biochemical parameters viz. serum glutamine oxaloacetate transaminase (SGOT), serum glutamine pyruvate transaminase (SGPT), serum alkaline phosphatase (ALP), total serum protein, total bilirubin content and liver biochemical parameters such as thiobarbituric acid reactive substances (TBARS) and reduced glutathione content were estimated. Biochemical and histopathological observations indicated that MECT had remarkable hepatoprotective effect against paracetamol-induced liver damage in rats. © 2011 Berkeley Electronic Press. All rights reserved.