Levothyroxine sodium

Levothyroxine sodium is the first-line treatment for hypothyroidism in all animal species. It is also used to treat feline symmetrical alopecia.

Chemical name

  • Sodium (2S)-2-amino-3-[4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenayl]propanoate (Ph. Eur.)
  • L-tyrosine-O-(4-hydroxy-3,5-diiodophenyl)-3,5-diiodo-monosodium salt, hydrate (USP)


  • Levothyroxine sodium
  • L-3,3’,5,5’-tetraiodothyronine

Product details

  • CAS number: 6106-07-6 (pentahydrate)
  • Formula: C15H10I4NNaO4 x 5 H2O
  • Molecular weight: 883.93 g/mol


WELDING supplies levothyroxine sodium from a qualified manufacturer with comprehensive documentation such as CEP, ASMF, GMP, US FDA.


  • 1-4 kg/drums; according to customer requirements   


Welding GmbH & Co. KG is not the manufacturer of the product. All product information and analytical data serves only as a product description and has been provided to us by the manufacturer. It may not be interpreted as a guarantee of special properties or a guarantee of suitability for specific purposes. The customer is required to examine the suitability of the product for the intended purpose himself/herself before use.