My almost 15 yr. old cat had treatment for hyperthyroidism in July 2013.,his thyroid was 13 so he was given the 2nd highest dose. He had been a 27 pound cat who had lost weight down to 9. The 3 day separation was hard but I had daily updates. At 1 month afterwards my cat had gained a pound and thyroid was down to 5. Now almost 3 months afterwards and he's doing great, has gained back 7 pounds. Radiocat was worth every $ to us!