Does taking karatom effect coumadin (warfarin) level?

Kratom?: There is no listing for karatom. I assume you mean kratom? The answer is: no one knows. It's never been systematically studied. I read about this herb: http://www.Erowid.Org/plants/kratom/kratom_effects.Shtml - like so many herbs, it claims highly variable and opposite effects. My personal feeling is that it is foolish to use such drugs - you have no idea what you're actually getting.