Levothyroxine Sodium API Pharmaceutical Grade from Mexico
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.
Duty Rate — Mexico → United States
100%
Rate breakdown
9903.04.60100%Except as provided in heading 9903.04.61, patented pharmaceutical articles as provided for in subdivisions (c) and (d) of U.S. note 40 to this subchapter
9903.05.860%Articles provided for in subdivision (b) of U.S. note 52 to this subchapter
Import Tips
• 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