I myself was on Euthyrox and Tertroxin.... and the Doctor I had refused putting me on anything else, but I now have a new doctor as the other one left and the new one took me off the Tertroxin and Euthyrox and put me on Eltroxin. His reasoning is because my Thyroid readings are 100%. Well I hope he is right....will see again with my next blood tests. We just have to trust these doctors