A pharmaceutical composition for treatment and prevention of liver fibrosis and cirrhosis, which comprises 5-(2-pyrazinyl)-4-methyl-1,2-dithiol-3-thione (oltipraz) and dimethyl-4,4'-dimethoxy-5,6,5',6'-dimethylene dioxybiphenyl-2,2'-dicarboxylate (DDB) as major components, is provided. The ratio of oltipraz and DDB of said composition is preferably 25:0 25, more preferably 5:0.1 5, particularly preferably 5:1. Oltipraz/DDB formulations according to the present invention exhibit surprisingly good effect on the treatment and prevention of liver fibrosis and cirrhosis and are safe drugs that have low toxicity in the human body.