One case report exists of a person in which it appears that combined use of chamomile and warfarin led to internal bleeding.ħ4 ChondroitinPossible Harmful Interactionīased on chondroitin’s chemical similarity to the anticoagulant drug heparin, it has been suggested that chondroitin might have anticoagulant effects as well. Some coumarins have blood thinning actions that could interact with warfarin. The herb chamomile contains substances in the coumarin family. Since the amount of vitamin K in alfalfa varies widely, it is difficult to give an exact safe upper dose.Īs a precaution, avoid alfalfa supplements during warfarin therapy except under medical supervision. Vitamin K directly counteracts warfarin's blood-thinning effects. The relatively high vitamin K content in alfalfa could reduce the effectiveness of warfarin. Similar blood-thinning drugs are anisindione (Miradon) and dicumarol. : If you are taking warfarin, we do not recommend taking any herb or supplement except on a physician's advice. It is a somewhat dangerous drug that can be affected by many substances, including food. Warfarin (Coumadin) is an anticoagulant used to thin the blood and prevent it from clotting.
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