Heparin sodium injection is used to prevent and control thrombosis and thrombotic diseases, such as myocardial infarction, thrombophlebitis, pulmonary embolism, etc.; diffuse intravascular coagulation caused by various reasons; it is also used in the operations of hemodialysis extracorporeal circulation, catheterization, microvascular, surgery, etc. and anticoagulation treatment of certain blood specimens or instruments. Its specific dosage is: 1, deep subcutaneous injection, the first 5,000-10,000 units, after 8,000-10,000 units every 8 hours or 15,000-20,000 units every 12 hours, a total of about 30,000-40,000 units per 24 hours. 2, intravenous injection, the first 5,000-10,000 units after the use of weight per hour can be 100 units per kg, diluted with sodium chloride injection. 3, intravenous infusion, 20,000-40,000 units per day added to sodium chloride. -40,000 units added to 1000ml of sodium chloride injection for continuous drip. 4.Prophylactic treatment, for patients at high risk of thrombosis, mostly used after abdominal surgery to prevent deep vein thrombosis. 5,000 units of heparin is given subcutaneously 2 hours before surgery, then 5,000 units every 8-12 hours for about 7 days.