Coumadin Interaction with herbs, vitamins, enzymes, food, diet restrictions and natural supplements, risks, and side effects November 20 2016 by Ray Sahelian, M.D. Summary. Drug interactions are reported among people who take Coumadin and Carvedilol together. This study is created by eHealthMe based on reports of 1,815 people who take Coumadin and Carvedilol from FDA, and is updated regularly. Coumadin is a prescription anticoagulant drug for patients at risk for blood clots. Each patient begins on a low dose, and then receives higher doses under a doctor's close supervision. Coumadin, a brand name of the drug warfarin, is a blood thinner given to prevent or slow the formation of plaque and clots in your blood vessels. Compare prices, print coupons and get savings tips for Coumadin (Jantoven and Warfarin) and other Atrial Fibrillation, Heart Attack, Deep Vein Thrombosis, and Pulmonary Embolism drugs at CVS, Walgreens, and other pharmacies. Prices start at $4.00 Coumadin -- also known by its generic name warfarin -- is a blood-thinning medication. Your physician may prescribe Coumadin if you are at risk for or have experienced a heart attack, stroke or blood clots. While Coumadin can be a life-saving medication, it also is associated with many adverse drug Warfarin (brand names: Coumadin, Jantoven) is a prescription medication that interferes with normal blood clotting (coagulation). It is also called an anticoagulant. Many people refer to these medicines as blood thinners, although they do not actually cause the blood to become less thick, only Coumadin is a blood-thinning drug often prescribed in patients suffering from blood clots and pulmonary embolisms. Coumadin interferes with vitamin K, which is a necessary component for the production of clotting factors. Identify these serious sertraline oral (Zoloft Oral) drug interactions with the RxList drug interaction checker tool. My advice? If you’re not having significant side effects from Coumadin and seem to be doing well on the drug, stay with it. Andrew Weil, M.D.