First, I'm just a lay person. I can only comment on what I know for sure. I want to share an experience I had with my cat. About a year ago she was being treated with Atopica for a skin condition. She developed tremors, she would just sit there and her leg would start to shake. I read the side effects on the insert of the meds and low and behold, in very, very small print, and listed as one of the very rare side effects was tremors. The vet called the manufacturer and of course, they had never seen that as a side effect. I wasn't taking any chances, so we switched to prednisone(unfortunate, however, no choice), and while it took awhile for the Atopica to get out of her system, the tremors went away. I'm only telling this story in reference to the sentinel that Max had. Just wondering if they are still considering that to be an issue? I'm really hoping it is something as simple as that. Hugs for you and Max
