Less serious warfarin side effects to tell your doctor about What warfarin side effects should you watch for? Warfarin side effects that require immediate medical attention Less-serious warfarin side effects to tell your doctor about What precautions can you take against warfarin side effects? What drugs and supplements can interact with warfarin? What foods and drinks might interact with warfarin? Content When is warfarin prescribed? What are the side effects of warfarin? What can increase the risk of bleeding? What drugs, supplements and foods interact with warfarin? What does vitamin K have to do with warfarin? What can you do to lower the risk of bleeding? What should you do if you forget a dose?