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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If classified as polypeptide hormones rather than amino-acid derivatives
Polypeptide hormones like insulin fall under 2937.90.20, but levothyroxine is specifically amino-acid derivative per subheading.
If imported as formulated tablets or capsules rather than bulk API powder
Finished pharmaceutical dosage forms move to Chapter 30; bulk API stays in Chapter 29 as chemically defined compound.
If containing sugar ethers/esters as impurities exceeding Chapter 29 tolerances
Sugar derivatives excluded from Chapter 29 per note 2(c); pure l-thyroxine sodium remains classified here.
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Import Tips & Compliance
• Ensure USP certification and FDA compliance; provide Certificate of Analysis (CoA) documenting purity >98% and l-thyroxine sodium identity
• Include full chemical documentation proving it meets Chapter 29 hormone definition; avoid misclassification as general amino acid
• Verify proper cold chain logistics if required; common pitfall is improper stability testing for transport
Related Products under HTS 2937.90.40.00
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.
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.