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. The exogenous liothyronine product was developed by King Pharmaceuticals and FDA approved in 1956.
Liothyronine is officially approved for the following indications:
In general terms, exogenous liothyronine is used to replace insufficient hormonal production and restore T3 plasma levels.
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Global Medical Institutes, Princeton, New Jersey, United States
Hadassah Medical Organisation, Jerusalem, Israel
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