Warfarin is taken once daily at the same time every day, preferably in the evening, with or without food
Many drugs can potentially interfere with warfarin
and may cause your INR
to change, putting you at risk for bleeding or a clot. These drugs include prescription medications, over-the-counter medications (like aspirin, ibuprofen, naproxen), and dietary and herbal supplements. They should be avoided unless otherwise directed by health provider.