Description
Liothyronine is a thyroidal hormone T3 which is normally produced by the thyroid gland in a ratio 4:1 when compared with T4: T3. Liothyronine is the active form of thyroxine which is composed in a basic chemical structure by a tyrosine with bound iodine.3 The exogenous liothyronine product was developed by King Pharmaceuticals and FDA approved in 1956.8
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