55-03-8 Dathroid Eltroxin Euthyrox L-Thyroxine monosodium salt L-Thyroxine sodium L-Thyroxine sodium salt L-Tyrosine, O-(4-hydroxy-3,5-diiodophenyl)-3,5-diiodo-, monosodium salt Laevoxin Letter Levaxin Levoroxine Levothroid Levothyroxine sodium Monosodium thyroxine NSC259940 Oroxine Ro-thyroxine Roxstan Sodium L-thyroxine Sodium l-thyroxin Sodium levothyroxine Sodium thyroxin Sodium thyroxinate Sodium thyroxine Synthroid Synthroid Sodium Thyroxevan Thyroxine sodium Thyroxine sodium salt Thyroxine, monosodium salt, L-