I have a kitty dealing with hyperthyroid and he handles the pills just fine. He isn't gaining much weight (been on the pills almost a year) but he is acting like a normal cat otherwise. Plays, jumps up on things, bosses my other cat around, etc... My vet told me to watch his urine output because one of the signs that tapazole (or methimazole, which Mac takes) isn't working or helping the problem is that they will pee A LOT and spend more time sleeping. Get Emily to the vet. There are other ways of dealing with this condition that don't involve medicine which isn't effective.