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Medical Definition of Sodium levothyroxine
1. 3,3',5,5'-tetraiodothyronine pentahydrate;Sodium salt of the natural isomer of thyroxine, a thyroid hormone. It is twice as effective as the racaemic form. Used in the treatment of hypothyroidism in humans and animals and to treat lowered fertility in bulls and to stimulate lactation in animals. (05 Mar 2000)