Lifelong consumption of warfarin usually causes certain adverse reactions to the organism, which vary from person to person, and the adverse reactions may include abnormal bleeding, liver damage and other hazards. Warfarin is a kind of anti-platelet agglutination drug in clinic, which can prevent the formation and development of thrombus, and is used for the treatment of thromboembolic diseases, and it can be given as prophylactic drug to the patients who have had thromboembolic disease and those who have the risk of postoperative thrombotic complications. 1. Abnormal bleeding: long-term administration of warfarin may cause abnormal bleeding in some organs of the body, with gastrointestinal bleeding being the most common. 2. Liver damage: long-term use of warfarin may cause some harm to the liver, the liver needs to bear the toxic damage while decomposing the drug. Warfarin long-term use may produce adverse reactions to the organism, but it varies from person to person, it is recommended to use the drug under the guidance of a doctor, not blindly self-medication or stopping the drug, in order to avoid adverse effects.