All adult patients with severe cirrhosis might be randomized after written consent. Patients with severe carcinoma, intolerance or contraindication to pentoxifylline will not be included. Patients receive either pentoxifylline or placebo 3 times a day for 6 months. Three hundred and forty two patients are necessary to decrease mortality rate by 50% at 2 months in a beta risk of 10% and an alpha risk of 5%. Patients will be seen every month.