This is because vitamin K is the antidote for warfarin. And finally, patients taking warfarin should avoid eating an excess amount of leafy greens, and other foods high in vitamin K. Warfarin is also teratogenic and should not be given to pregnant patients. A therapeutic INR level for a patient on warfarin is between 2 and 3. To reduce the risk of severe bleeding, patients are monitored using the PT and INR levels. Along with its blood thinning action comes an increased risk for uncontrolled bleeding. Clinically, warfarin is used to prevent the formation of DVTs, pulmonary embolisms, heart attacks, and strokes in patients who are at high risk of developing blood clots. Summary Warfarin is a medication that is used to prevent blood clots, which is why it is classified as a blood thinner or anticoagulant.
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