Sulfisoxazole Diolamine from Mexico
Sulfisoxazole diolamine is the diethanolamine salt of sulfisoxazole, used in ophthalmic and systemic antibacterial formulations. It qualifies for HTS 2935.90.95.00 as a salt of a sulfonamide antibiotic, classified with the parent sulfonamide per Chapter 29 salt classification rules.
Duty Rate — Mexico → 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
9903.05.5510%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
• Salt identification via NMR required; diolamine content affects solubility classification
• Ophthalmic grade needs additional microbial limits testing documentation
• Avoid bulk packaging >25kg; triggers additional GMP scrutiny