Abstract: The present study was designed to test the effect of the crude methanolic extract of Peperomia pellucida (L.) HBK on the antioxidant and redox enzymes. Twenty-five rats were divided into five groups that received different treatments. These rats were sacrificed and the liver was obtained to estimate the antioxidant superoxide dismutase (SOD) and catalase (CAT) and redox thioltransferase (TT) and thioredoxin reductase (TrxR) enzyme activities by spectrophotometry and to examine the physiological state of the liver by histopathological analysis. The crude methanolic extract of P. pellucida increased the activities of antioxidant enzymes (SOD and CAT) while redox enzyme (TT and TrxR) activities were greatly decreased. It was found out that 400 mg kg-1 b.wt. of P. pellucida extract was the most effective concentration and this finding was further supported by lesser incidence of fibrosis and necro-inflammation in the histopathological analysis of liver subjected to such dosage. Based on this result, it can be concluded that the crude methanolic extract of P. pellucida (400 mg kg-1 b.wt.) has a potent antioxidant activity because of its ability to elevate SOD and CAT and lower TT and TrxR activities under oxidative stress.