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Warfarin is a blood thinning drug. It is very useful for treating and preventing blood clots. The blood thinning property of warfarin is measured by a blood test called INR (International Normalised Ratio); the finger-prick test each time a patient visits the anticoagulant clinic. The INR value needs to be maintained within a narrow target range (2.0-3.0 for most types of clotting disorders) for safe and effective treatment. The INR value can sometimes go above the set target range which can increase the risk of bleeding. As such vitamin K is used as an antidote to reverse INR

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Q: What is vit k an antidote for?
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