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Warfarin is used to treat blood clots (such as in deep vein thrombosis-DVT or pulmonary embolus-PE) and/or to prevent new clots from forming in your body. Preventing harmful blood clots helps to reduce the risk of a stroke or heart attack.
Answers. Best Answer: Warfarin is a type of drug that acts on your intrinsic coagulation pathway (in your liver). Besides cleaning out your blood, the liver also creates several clotting factors that help your platelets stick together to form clots. One of these factors is Vitamin K. It itself does not stick to platelets. Rather, it helps the other factors transform and bind together. Long story short, warfarin keeps your liver from making vitamin K and your gut from absorbing it. How long it stays depends on your liver's ability to make vitamin K to use up the remaining warfarin.