Levothyroxine Sodium
C15H10I4NNaO4·xH2O (anhydrous)
798.85
l-Tyrosine, O-(4-hydroxy-3,5-diiodophenyl)-3,5-diiodo-, monosodium salt, hydrate;
Monosodium l-thyroxine hydrate
[25416-65-3] Anhydrous [55-03-8]
l-Tyrosine, O-(4-hydroxy-3,5-diiodophenyl)-3,5-diiodo-, monosodium salt, hydrate;
Monosodium l-thyroxine hydrate
[25416-65-3] Anhydrous [55-03-8]
DEFINITION
Levothyroxine Sodium is the sodium salt of l-3,3′,5,5′-tetraiodothyronine. It contains NLT 97.0% and NMT 103.0% of levothyroxine sodium (C15H10I4NNaO4), calculated on the anhydrous basis.
USP REFERENCE STANDARDS FOR PURCHASE
USP Levothyroxine Peak Identification Mixture RSUSP Levothyroxine RS
USP Levothyroxine Sodium RS
USP Liothyronine RS