Should be no difference whether taken with food or not, but most important dietary advice is to keep a medium but regular diet of veges etc and never go overboard on one particular food esp tomatoes, onions and chocolate!!!
If ever on broad spectrum antibiotics, your INR can go absolutely skyhigh...so it is best to get monitored more frequently on these occasions. Also avoid Gingko, and substantially limit ginger, garlic, green tea and alcohol!
Hope this helps
Liz