Even a small Coumadin overdose can be extremely dangerous. The most serious effect of an overdose with this medication is bleeding, including internal bleeding. Q. I have a question about the coagulation lab tests. I saw that an increased PT would result from Coumadin and Heparin. Do these both work to activate. Your free source for healthy, Coumadin (warfarin) safe recipes from Dr. Gourmet. Diet plans, nutrition information including vitamin K, and what you need to know to. Coumadin is used to prevent heart attacks, strokes, and blood clots in veins and arteries. Learn about side effects, interactions and indications. What else should you know about warfarin (Coumadin)? Alcoholic Beverages Alcohol can affect your warfarin (Coumadin) dose and should be avoided. Learn about clinical pharmacology for the drug Coumadin (Warfarin Sodium). Why is this medication prescribed? Coumadin aka Warfarin aka Jantoven is used to prevent blood clots from forming or growing larger in your blood and. Find patient medical information for Coumadin oral on WebMD including its uses, side effects and safety, interactions, pictures, warnings and user ratings. Learn about the prescription medication Coumadin (Warfarin Sodium), drug uses, dosage, side effects, drug interactions, warnings, reviews and patient labeling. Warfarin, also known by the brand names Coumadin among others, is an anticoagulant normally used in the prevention of thrombosis and thromboembolism, the formation of.