I was on pradaxa for 2 days, horrible drug, I bled like a stck pig, then tried Xarelto, because of the no monitoring, i starded getting headaches and sore kidneys after a few months. Went back to warfarin, so I gotta get a blood test ocassionally, big deal, but better for it. Coumadin my understanding is it's a temporary thinner till propper diagnosis and monitoring can be done. I was on it for a very short time when I started getting sick. But my heart disease is life long, had it since birth. Got my pacemaker at 39 yrs old.