Since taking diotroxin, 1 and a half years ago, I lost all the weight I put on due to my under active thyroid. Last November I went onto the 3 month birth control injection and I started putting on weight again. In January I went off the injection, continued taking my diotroxin, but have since last November put on 10 kg's. I have all the symptoms of an under active thyroid even though I am taking my diotroxin daily. Is it possible that the diotroxin no longer has an effect on me and what should I do?