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 (Jantoven) is a medicine to prevent blood clots. It may save your life if you've had blood clots or are at risk of them. But warfarin can sometimes cause serious side effects, such as heavy bleeding. It's important to have regular health checkups if you take the medicine. The same action of. NHS information about the medicine warfarin, including what it's used for, who can use it, how to use it and side effects. Warfarin is used to treat blood clots and/or to prevent new clots from forming in your body. Learn about side effects, drug interactions, dosages, warnings, and more. Warfarin, sold under the brand name Coumadin among others, is used as an anticoagulant medication. [11][8] It is commonly used to prevent deep vein thrombosis and pulmonary embolism, and to protect against stroke in people who have atrial fibrillation, valvular heart disease, or artificial heart valves. [11] Find patient medical information for Warfarin on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings 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. Learn about the side effects of warfarin, from common to rare, for consumers and healthcare professionals. Warfarin is an anticoagulant used to prevent heart attacks, strokes, and blood clots. Learn about side effects, interactions and indications. 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.