3,3',5,5'-Tetraiodo-L-thyronine, sodium salt 55-03-8 67809-22-7 Dathroid EINECS 200-221-4 Eltroxin Euthyrox L-Thyroxine monosodium salt L-Thyroxine sodium L-Tyrosine, O-(4-hydroxy-3,5-diiodophenyl)-3,5-diiodo-, monosodium salt Laevoxin Letter Levaxin Levo-T Levoroxine Levothroid Levothyroxin-natrium Levothyroxine Sodium [USAN] Levothyroxine sodique [INN-French] Levothyroxine sodium Levothyroxine sodium anhydrous Levothyroxinum natricum [INN-Latin] Levotiroxina sodica [INN-Spanish] Levoxyl NSC 259940 Oroxine Ro-thyroxine Roxstan Sodium L-thyroxine Sodium l-thyroxin Sodium levothyroxine Sodium thyroxin Sodium thyroxinate Sodium thyroxine Sodium-L-thyroxine Synthroid sodium Tetroid Thyradin S Thyro-Tabs Thyronamin Thyroxevan Thyroxin sodium Thyroxine sodique Thyroxine sodium Thyroxine, monosodium salt, L- Thyroxinum natricum Unithroid