Enoxaparin sodium is a low molecular weight heparin preparation, clinically known as low molecular weight heparin. It has strong antithrombotic and thrombolytic effects. Enoxaparin sodium, usually 1mg/kg, subcutaneously, every 12 hours. An intravenous injection may be administered when the dose is loaded. For the elderly and patients with kidney failure, to pay attention to appropriate reduction. Clinically, it is mainly used for the prevention of venous thrombosis after surgery, the prevention of deep venous thrombosis, the treatment of pulmonary embolism, deep venous thrombosis and the treatment of acute coronary syndrome. The biggest complication of enoxaparin sodium is hemorrhage.