Dextropropoxyphene Napsylate from Mexico
Dextropropoxyphene napsylate is a water-soluble salt of dextropropoxyphene, formerly used in combination pain medications like Darvon-N. Classified under HTS 2922.14.00.00 due to chapter notes specifying salts of this INN compound as oxygen-function amino-alcohols.
Duty Rate — Mexico → United States
110%
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
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• Verify salt identity via HPLC testing to distinguish from hydrochloride and ensure correct HTS classification
• File prior notice with FDA for chemical imports and monitor DEA scheduling (now Schedule II equivalent)
• Avoid bulk packaging over stabilizer limits per chapter note (f) to prevent reclassification as mixtures