... been stable till November then the Hemifumerate was replaced with Bisiprolol Fumerate. My INR has been below 2 ever since. Apparently there is no significant difference between the two drugs so why is this happening. I have also been experiencing increasing anxiety, palpitations and a recurrance of the A Fibs which I thought was because of the excitement of Christmas but I'm beginning to think this may also be related to the change, it's the only thing I can put it down to.
Has anyone else noticed any differences while taking these drugs?