Fibrinolytic enzyme injection has the effect of unblocking blood vessels, improving microcirculation and defibrinizing, and is mainly used in the treatment of peripheral vascular diseases such as cerebral infarction, hypercoagulable state and thrombotic vasculitis in the clinic; it mainly achieves the therapeutic purpose by acting on the fibrinogen and fibrin and degrading them into small molecule soluble fragments, which are easy to be decomposed and cleared from the blood circulation. Fibrinolytic enzyme injection adverse reactions include can cause trauma, injection site, skin and mucous membrane bleeding, can cause headache, dizziness, a very small number of patients can cause allergic reactions, etc.; for coagulation mechanism disorders, bleeding tendency of the patient is prohibited; severe hepatic and renal impairment, peptic ulcer patients are prohibited; pregnant women and lactating mothers are prohibited; children should be used with caution. The use of fibrinolytic enzyme injection need to pay attention to, this product is a protease preparation, there is a certain antigenicity, clinical use should be carried out before the skin test, skin test positive reaction should be prohibited; use of medication in the process of the affected limbs such as swelling and numbness, soreness, headache, etc. can disappear or relieve, without special treatment; such as the emergence of hematuria or subcutaneous hemorrhage points, should immediately stop using and symptomatic treatment. The above content is for reference only, patients who need to use fibrinolytic enzyme injection, please under the guidance of a professional doctor to follow medical advice.