Warfarin use and aikido

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[p00kiethebear]

I've been on a drug now called Warfarin for about two years because of blood clotting issues. This drug thins my blood out a little to keep things moving around.
I haven't had any problems with it interfering with my training or anything, but i was wondering if anyone else has? Some people apparently tend to bruise quite a bit while on it, but I haven't. Is there anyone who practices aikido and uses it and HAS had problems? If so what were they?

Thanks