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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If classified under steroid/polypeptide hormones instead of amino-acid derivatives
Subheading structure separates hormone types; 2937.90.40 specifically names l-thyroxine sodium.
If for carboxylic acid function without full hormone characterization
Thyroxine's ether-carboxylic structure could fit 2918 if not proven as primary hormone per note 7(b).
If pre-formulated as medicaments in bulk packaging
Mixed medicaments enter Chapter 30; pure API bulk powder remains Chapter 29 hormone.
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Import Tips & Compliance
• Brand-specific CoA required; cross-reference with ANDA approvals for generic equivalence
• Monitor for DEA scheduling if combined with controlled substances (unlikely for pure API)
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 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.
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.