I've known many including my Grandfather that have taken Coumadin with good results. It, like virtually everything has potential side effects. The most serious involving an otherwise small internal bleed being unable to clot. If that happens in your noggin it can be bad stuff. Bleeding from minor cuts and scrapes is usually copious but with a site specific clotting agent or styptic pencil can be contained. My personal experience with anti-coagulants is confined to Heparin which we used to keep an IV line open for continued use. As always talk to your Doc and don't be afraid to get a 2nd or 3rd opinion.

Best of health to you Jerry and Merry Christmas.