I split pills as needed. In fact, after I posted that message for you about the 10mg tablets, I started wondering why I don't get my doc to write for them for me. I take 5mg a lot of days, and taking half of a 10mg would be cheaper. I take generic warfarin. WalMart has all their generic warfarin priced at $4 for 30 tablets, regardless of the number of milligrams in the tablet. If you split a 10mg tablet to get two 5mg doses, you get twice the bang for the buck.
Of course Al Lodwick was talking about Coumadin, not warfarin. I can't tell you for sure if 10mg warfarin is dye-free.