Cytomel (liothyronine sodium) (liothyronine sodium) Tablets contain liothyronine (L-triiodothyronine or LT3), a synthetic form of a natural thyroid hormone, and is available as the sodium salt.
www.rxlist.com/cytomel-drug.htm There are only a few natural thyroid medicine out there, but you might want to try something other than Armour - which I'm on as well.
I have a friend that didn't do well with Armour, but once she switched to Naturethroid, she did wonderful.