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How does warfarin interact with vitamin K?

Individuals taking anticoagulant (anticlotting) medications such as warfarin (also known as Coumadin) need to keep a consistent intake of vitamin K. This medication decreases the activity of vitamin K and prolongs the time it takes for blood to clot. If these individuals suddenly increase the vitamin K in their diets, the vitamin can override the effect of the drug, enabling the blood to clot too quickly.

In contrast, a sudden decline in dietary vitamin K can enhance the effectiveness of the drug.

Green leafy vegetables are rich sources of vitamin K.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.