☆ Does warfarin need to be taken every day? Patients with atrial fibrillation need to take it consistently for a long time. ☆ Patients should have their blood drawn regularly to check the INR value. What is the optimal value of INR? It is important to monitor the INR value during the course of warfarin administration. INR stands for International Normalized Ratio, which reflects the anticoagulant effect of warfarin. Generally speaking, an INR value within the range of 2.0-3.0 has the best anticoagulant effect, which means that the risk of thromboembolism is minimized and the risk of cerebral hemorrhage is also minimized. ☆ How often should I check my INR after taking warfarin, and should the amount of warfarin be adjusted according to the size and fluctuation of this value? Warfarin is available in two dosage forms 2.5mg and 3.0mg, and the dose for most patients is 3.0mg. Initially, the INR needs to be monitored by blood sampling once a week, and after the INR has stabilized, it can be reduced to once a month. After one or two years of stabilization, monitoring can be done once every 2-3 months. When the drug is first started, the dose adjustment of warfarin should be based not only on the measured value of INR, but also on the trend of INR changes. Generally, on the 5th day after the application of warfarin, if the INR has a tendency to increase, but has not yet reached the lower limit of the therapeutic target, it should be noted that a dose reduction is needed if necessary. It should be noted that the INR does not change until several days after warfarin dose adjustment, so dose adjustment should not be too frequent. Generally speaking, if the INR value increases only a little, such as 3.2 or 3.3, it is not necessary to stop the drug, and it is enough to draw blood again in a few days to enhance monitoring. If this happens repeatedly, you should consider whether you need to adjust your medication. For example, if the INR of a patient taking warfarin for a long time is stable outside the target range for several measurements, and the target target is 2.0-3.0, for example, and the results of three consecutive INR measurements are 2.0, 1.8, and 1.8, you can consider increasing the warfarin dose appropriately. However, when there are large differences between consecutive measurements, such as 2.0, 3.0, and 1.8, it is best to maintain the original dose. patients with large fluctuations in INR are most likely to experience thromboembolism or bleeding complications, and these patients should be reminded to maintain a stable intake of vitamin K in their diet, take the medication as prescribed, and monitor INR regularly. However, if INR values fluctuate widely, such as a 5.0 or even 10.0, it may be necessary to discontinue the medication while looking for causes, such as whether antibiotics are being taken, or whether it has not been monitored for a long time. ☆ Does this medication have to be taken after dinner? What should I do if I miss a dose? Do I need to double the amount? Patients always ask when they should take warfarin once a day, because warfarin is metabolized slowly and therefore its effect is not related to the exact time of day. If you miss a dose of warfarin on one day, you can add half a tablet the next day; and return to normal on the third day. ☆ Will the anticoagulant effect of warfarin be affected by the fact that some patients are also taking other medications? Many medications have an effect on the effects of warfarin, the most common of which are antibiotics. If the medication a patient is taking changes, such as taking antibiotics for several days in a row, it is important to consider whether the medication needs to be adjusted or if monitoring should be increased. However, if the medication taken remains the same year-round, there is no need to worry much about it. ☆ Does some diet also have an effect on the application of warfarin? How should I control my diet while taking this medication? Many foods can also affect the anticoagulant strength of warfarin. Therefore, patients are advised to maintain a relatively balanced diet structure, reduce the intake of foods rich in vitamin K appropriately, and not to add nutrients and supplements blindly. What are the foods that enhance the anticoagulant effect of warfarin? Some foods can enhance the anticoagulant effect of warfarin, such as garlic and warfarin together can enhance the anticoagulant effect of warfarin; fish oil enhances the anticoagulant effect of warfarin by inhibiting platelet aggregation and reducing the level of coagulation-related thromboxane and vitamin K-dependent coagulation factors; grapefruit contains coumarin compounds, which can also inhibit the activity of liver-related drug metabolizing enzymes and reduce the metabolism of warfarin, so that the anticoagulant effect is The combination of mango and warfarin can also enhance its anticoagulant effect. What are the foods that weaken the anticoagulant effect of warfarin? Many green vegetables, including spinach, cabbage, asparagus, celery, kale, and peas, are rich in vitamin K, which can reduce the anticoagulant effect of warfarin.