That's the med that Boo is on, Penny. I just recently adjusted his med to 1/2 tablet twice a day and he's doing much better. He was hanging his head like a horse and I recalled my mother doing that very thing when she needed her thyroid meds adjusted. Boo was on 1 pill twice a day and he was hardly eating at all; he was too thin already! Since I've adjusted his med, though, he's doing much better and no head hanging. So if Gatsby appears to get worse before he gets better, don't worry too much. Just talk to your vet about adjusting his med. Boo is 19 and he's been hyperthyroid for about a year or so now. Poor Gatsby; you're right, he doesn't need this. I'm sure you'll get it worked out, though. Keep the faythe.