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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