Levothyroxine Sodium API Pharmaceutical Grade
Pharmaceutical-grade levothyroxine sodium active pharmaceutical ingredient (API) for compounding thyroid replacement medications. Classified under HTS 2937.90.4000 as the specific sodium salt of synthetic l-thyroxine hormone, an amino-acid derivative used primarily as hormone therapy.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If imported without proven primary hormonal use documentation
Heterocyclic compounds without specific hormone function fall under 2933; Chapter 29 note 7(b) requires hormonal purpose proof.
If for mixtures with excipients exceeding 10% w/w
Chemical mixtures not qualifying as Chapter 29 pure compounds move to mixtures heading 3824.
If labeled for immunological/veterinary hormone use
Immunological products excluded from Chapter 29 per note 2(e); human therapeutic hormones stay here.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Submit Drug Master File (DMF) reference and FDA import alert screening; critical for API classification
• Provide HPLC chromatograms confirming l-isomer purity; racemic mixtures may alter classification
• Declare exact CAS 25416-49-1; mislabeling as generic 'thyroxine' risks reclassification
Related Products under HTS 2937.90.40.00
Levothyroxine Sodium USP Powder
Levothyroxine sodium USP is the sodium salt of l-thyroxine, a synthetic thyroid hormone used primarily for treating hypothyroidism. It falls under HTS 2937.90.4000 as an amino-acid derivative hormone, specifically l-thyroxine sodium, meeting Chapter 29's criteria for chemically defined organic compounds used as hormones.
Levothyroxine Sodium BP/EP Grade
European Pharmacopoeia (EP) and British Pharmacopoeia (BP) compliant levothyroxine sodium for international thyroid hormone formulations. Falls under HTS 2937.90.4000 as the chemically defined sodium salt of l-thyroxine, a Chapter 29 hormone derivative.
Veterinary Levothyroxine Sodium Powder
Levothyroxine sodium powder formulated for veterinary thyroid treatment in dogs and cats. Classified in HTS 2937.90.4000 as l-thyroxine sodium hormone regardless of human/animal therapeutic use, per Chapter 29 hormone provisions.
Synthroid Active Ingredient Levothyroxine Sodium
Bulk levothyroxine sodium serving as the active ingredient in brand-name Synthroid tablets for hypothyroidism treatment. HTS 2937.90.4000 applies to this specific l-thyroxine sodium salt as a synthetic hormone amino-acid derivative.