Has anyone had this from Azathioprine? I'm not sure how serious it is. I had been on a higher dose for a month, and after my blood tests the GI called me and told me to stop taking them, that my blood tests were low. I have to go in and get the blood tests redone in a few days to see if getting off helped. I really couldn't ask the doctor too many questions on the phone, because I was really being sick that day. Mainly I just notice that I get very out of breath, and have to do everything bit by bit. I'm not working at the moment, thankfully.