I take warfarin, which is the same a coumadin. I eat and drink ginger and it appears to have no effect on my INR. If ginger is a regular part of your diet and it seems to affect your INR then you can adjust your dosage to compensate. However there is food such as grapefruit which you should not eat.
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The only foods indicated int he British National Formula for interacting wth warfarin is cranberry and grapefruit juice so you are most likly safe with eating ginger