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How can my diet or medications affect how warfarin works?

Changes in diet can modify warfarin's effects, especially if your vitamin K intake changes. For instance, suddenly eating lots of green leafy vegetables, which are loaded with vitamin K, might diminish the benefits of a warfarin dose that has been working well.

Medications such as antibiotics, nonsteroidal anti-inflammatory drugs, and certain antidepressants can intensify the action of warfarin; so can alcohol. Let your doctor know if you use any of these.

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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.