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What can affect how much warfarin I need?

Anthony L. Komaroff, MD
Internal Medicine
Warfarin (Coumadin and others) has been the mainstay "blood thinner" used by millions of people to lessen the chances of developing a harmful, or possibly fatal, blood clot. But many things can affect how the drug works, including what you eat and drink, your health, and a number of drugs, vitamins, supplements, and herbal remedies. As a result, people taking warfarin need routine blood tests for their international normalized ratio (INR), a measure of the time it takes blood to clot. The results tell your doctor if your warfarin dosage needs adjusting.

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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.