Warfarin is an oral anticoagulant drug that can inhibit clotting factors, reduce the state of blood hypercoagulation, and prevent the formation of blood clots. Matters that should be noted during taking warfarin are as follows: 1. Take the medication regularly, warfarin is taken once a day, preferably at the same time every day, and the dose cannot be stopped or adjusted at will. If you forget to take your medication on time, try to take it within 4 hours and continue with your normal medication on the second day.2. Regularly monitor INR. Patients with warfarin overdose are prone to bleeding, so they need to find a balance between anticoagulation and hemostasis by monitoring the international standard ratio of prothrombin time, i.e. INR, which is too low to indicate that anticoagulation is not up to standard and too high to indicate a high risk of bleeding. Patients taking warfarin need to have their blood drawn regularly for rechecking coagulation indicators, once every 3 days when they first start taking it, and once every 1-2 months after stabilization.3. Regular diet, you should maintain a balanced diet while taking warfarin.