[Unclear hepatopathy in a patient with atrial fibrillation].

Although liver damage is a relatively rare adverse effect of oral anticoagulation with phenprocoumon, acute liver failure can be a serious treatment-associated complication. In this contribution, a patient with drug-induced liver failure during oral anticoagulation with phenprocoumon is presented. This case illustrates the need for close laboratory monitoring and suggests that phenrocoumon-induced liver damage should be considered along with other common complications of this treatment.