Another note of caution regarding Armour Thyroid. It made me very ill, I took it for 4 months, never stabilized on it and abandoned it when I became allergic to pork. In my experience there are real quality control issues with it and doses vary wildly from one bottle to the next. It is possible to get a prescription for T3 (liiothyronine),trade name Cytomel, to take alongside a prescription for thyroxine. The full replacement dose of T3 is 10 mcg. Your dose of T4 will need to be reduced a little to compensate for the added T3. I recommend the book written by endocrinologist Dr Ridha Arem, The Thyroid Solution which is easy to read, accepted by most doctors and readily available. He gives a formula of T4 to T3 ratio. Good luck with this, it makes a big difference when it is right and is pretty straight forward to sort out.