Objective: To investigate the effect of Huanshaodan on the activity of GSH - Px and the content of MDA of serum and liver tissue in SD rats. Method: The activity of GSH -Px and the content of MDA of serum and liver tissue in SD rats of old drug group, old control group and young control group were determined with different ways. The activity of GSH - Px was determined with the method of DTNB, and the content of MDA with the method of TBA. Result: Contrasted with the young control group, the activity of GSH - Px in serum and liver tissue had ...