Warfarin is an anticoagulant used to prevent heart attacks, strokes, and blood clots. Learn about side effects, interactions and indications. Coumadin is used to prevent heart attacks, strokes, and blood clots in veins and arteries. Learn about side effects, interactions and indications. Warfarin (Coumadin® and Jantoven®) is an anticoagulant medication or “blood thinner” you take to prevent and treat blood clots that can lead to a stroke or heart attack. Warfarin slows down your blood’s ability to clot. This helps keep unwanted clots from forming inside your blood vessels or heart when you have certain medical conditions or don’t walk or move around for a long time. Warfarin (brand names Coumadin and Jantoven) is a prescription medication used to prevent harmful blood clots from forming or growing larger. Beneficial blood clots help control bleeding, while harmful clots can block blood flow, potentially causing serious conditions such as heart attacks, strokes, deep vein thrombosis or pulmonary embolism. Because warfarin interferes with the formation of. Dosing of warfarin is complicated because it is known to interact with many commonly used medications and certain foods. [26] These interactions may enhance or reduce warfarin's anticoagulation effect. To optimize the therapeutic effect without risking dangerous side effects such as bleeding, close monitoring of the degree of anticoagulation is required by a blood test measuring an prothrombin. Description Warfarin is used to prevent or treat blood clots, including deep venous thrombosis or pulmonary embolism. It is also used for blood clots that may be caused by certain heart conditions, open-heart surgery, or after a heart attack. Warfarin is an anticoagulant (blood thinner) that decreases the clotting ability of the blood. This medicine is available only with your doctor's. Coumadin (Warfarin Sodium) may treat, side effects, dosage, drug interactions, warnings, patient labeling, reviews, and related medications including drug comparison and health resources. Find patient medical information for Warfarin on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings COUMADIN is a narrow therapeutic range (index) drug, and its action may be affected by factors such as other drugs and dietary vitamin K. Therefore, anticoagulation must be carefully monitored during COUMADIN therapy. Determine the INR daily after the administration of the initial dose until INR results stabilize in the therapeutic range. Coumadin is used to treat blood clots and to lower the chance of blood clots forming. Blood clots can cause a stroke, heart attack, or other serious conditions.