Tags: Drug.
Liotrix is 4:1 mixture of thyroxine (T4) and triiodothyronine (T3) made synthetically. It is used to replenish thyroid hormones in thyroid deficiency and hypothyroidism. The only brand of liotrix available in the U.S. is Thyrolar manufactured by Forest Laboratories. As of 2013 Forrest Laboratories has released the following statement regarding the limited availability of Liotrix: U.S.