^She's on methimazole, Nerys.
And fortunately, her kidney functions are very good. I was so mad at myself for not catching how much weight she'd dropped when we boarded her at the vet in the summer. When we got her back, she had more fur and was a happier cat. She slept on the bed with me again.
ETA: I checked the picture date and it was taken in August of 2010. Honestly, Casey hasn't changed much in three years other than the period of immense weight loss due to the hyperthyroid.