I am about to change from Warfarin to Edoxaban and I noticed that a rare side effect of Edoxaban is difficulty in speaking. I have been taking Warfarin since 2012 and over this period my ability to have a fluid conversation has significantly reduced. I keep pausing to think of the next word and sometimes I have the word I need to use and I immediately forget it before I can actually say it and then my brain is trying to find a substitute word. It is almost like a stutter except i never get to say the word. I have had a brain scan but there was nothing wrong and the cognitive tests were fine except when i had to recall names. I was wondering if this might be a chemical imbalance?