One of my cats was diagnosed with hyperthyroidism. Her T4 was 14.6. She was dosed with 5 mg Tapazole once a day. When I took her in 1 month later, they told my her T4 was 18 (?.) Vet upped her Tap to twice a day. The recheck after 1 month showed a T4 of 1.4. There was no follow up scheduled and when I inquired, I was told by the vet that she doesn't have to be seen for a year. This doesn't seem right. I am curious what others on this forum have experienced.