Food to Avoid While on Coumadin
Coumadin® (warfarin sodium) is known to interact with many different foods and beverages. While there is no specific food to avoid while on Coumadin, there are general guidelines that should be followed to help improve the safety of the medication.
If a person taking Coumadin consumes much more vitamin K than he or she usually does, this will make the medication less effective, which could increase the risk of blood clots. Similarly, if he or she consumes less vitamin K, this could increase the effects of Coumadin, perhaps even causing an overdose. You don't need to give up your favorite foods just because they are high in vitamin K; you simply need to keep your vitamin K intake fairly consistent.
There are a few other Coumadin food interactions that do not appear to be related to vitamin K. The prescribing information for the drug warns that people should avoid cranberry juice or other cranberry products, although there is considerable controversy about the significance of this interaction.
Alcohol intake can also affect Coumadin in various ways. A consistent, moderate intake is usually okay for most people. However, binge drinking or even "saving up" your daily drinks for the weekend can increase the risk of bleeding.
(Click Coumadin Diet to learn about other possible food interactions with Coumadin, the science behind such interactions, and why foods high in vitamin K could cause problems.)