Warfarin, or warfarin sodium tablets, has a primary role in anticoagulation. Warfarin sodium tablets are a bicoumarin-type intermediate-acting anticoagulant used in patients who require long-term continuous anticoagulation. It can play the role of anti-vitamin K, inhibit the synthesis of coagulation factors by liver cells, and also reduce thrombin-induced platelet aggregation reaction, thus playing the role of anticoagulation and antiplatelet agglutination. Clinically, it is mostly used in the treatment of thromboembolic diseases to prevent the formation and development of thrombosis; it can also be used to prevent the emergence of post-surgical or traumatic venous thrombosis, and as an adjunctive drug for myocardial infarction; it can be given as a prophylactic agent to patients with a past history of thromboembolism and to patients with postoperative thrombotic complications. The drug may have petechiae, purpura, bleeding gums, nausea and other adverse reactions, liver and kidney function impairment, severe hypertension and other patients and pregnant people prohibited warfarin sodium tablets. In addition menstruation and the elderly should use this drug with caution. Warfarin sodium tablets need to be used under the guidance of a doctor, not self-medication, so as not to cause discomfort.