Coumadin is a drug that helps prevent blood clots from forming in the body. Since Vitamin K works to form blood clots, Coumadin’s job is to decrease the activity of Vitamin K. In order for Coumadin to work properly, the diet must have a consistent amount of Vitamin K each day. If you were to have a sudden increase in Vitamin K in your diet, the drug would have a decreased effect on the body, and vice versa.
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