My Dad who is 77 has been on Coumadin since 2005 after a DVT following surgery, He also has Afib and has had it for years, due to a thyroid condition. he also has a pacemaker. He's been on Armour thyroid for at least 4 years, and tried Armour instead of Synthoid to see if he would feel better on Synthoid's alternative. Which he does actually feel better emotionally on the Armour. Here lately since his thyroid meds have been decreased it's been a struggle for him to maintain an INR of 2.5; his current dosing is 17.5 mg daily, and alternating 20mg every other day. Even with that dosing it's hard to keep his INR up. We are very careful with his diet and he basically eats no green leafy vegi. We have noticed since the addtition of the 20 mg every other day that his memory is fading quickly. We stuggle with the possibility of switching his blood thinner to Xeralto since he's had 2 falls in the past year and from what i've read if there is a bleeding event while on Xeralto, there is not way to stop it. Without an antedote we question if it would be wise to change. I should also mention that he did try Pradaxa last year and was on it for about 3 days when blood in his stool was noticed. Can you please help educate us on the benefits/risks for these drugs and is one any better or less dangerous for older folks. Thanks in advance for your help.