Warfarin is an anticoagulant drug and surgery is not recommended while patients are taking warfarin. Warfarin is mainly used to prevent and control deep vein thrombosis and pulmonary embolism, but also to prevent thromboembolic complications after myocardial infarction, such as embolism in the body circulation, stroke, and also to prevent thromboembolism that occurs after cardiac valvular disease, atrial fibrillation, and prosthetic valve replacement. The mechanism of action of warfarin works by inhibiting the synthesis of vitamin K-dependent coagulation factors and has the pharmacological effect of anticoagulation. Warfarin is not recommended for patients taking warfarin who are undergoing surgery while taking the medication, especially for patients who will be undergoing central nervous system or ophthalmic surgery in the near future or traumatic surgery that will result in a large open surface area. Patients taking warfarin may experience adverse reactions such as allergy, vasculitis, hepatitis, nausea and vomiting, dysgeusia, abdominal distension, rash dermatitis, bleeding, chills, etc. It is contraindicated in pregnant women, patients who will undergo surgery in the near future, patients with bleeding tendency, patients with preeclampsia, patients with eclampsia and preeclampsia. It is recommended that patients who are unwell go to regular hospitals in time and follow the doctor’s instructions for treatment.