Mefenamic Acid from Canada
Mefenamic acid is an anthranilic acid derivative with sulfonamide-related structure used as NSAID for dysmenorrhea and arthritis. Though primarily carboxylic acid, its sulfonamide characteristics place it under HTS 2935.90.95.00 as 'Other' sulfonamides.
Duty Rate — Canada → United States
110%
Rate breakdown
9903.04.6093.5%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
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
Import Tips
• Confirm sulfonamide moiety via FTIR; carboxylic acid function secondary
• Pain management API; monitor DEA precursor chemical list
• Light-sensitive; amber packaging documentation prevents degradation claims