Enoxaparin sodium is a low molecular weight heparin preparation, clinically called low molecular weight heparin. It has a strong antithrombotic effect and certain thrombolytic effect. Enoxaparin sodium, generally used as a dose of 1mg/kg, subcutaneously injected every 12 hours. A loading dose may be given intravenously. For the elderly and kidney failure patients, to pay attention to appropriate reduction. It is mainly used to prevent venous thrombosis after surgery, to prevent deep vein thrombosis, to treat pulmonary embolism, deep vein thrombosis and acute coronary syndrome. The biggest complication of enoxaparin sodium is hemorrhage.