Sulfapyridine
Sulfapyridine is a sulfonamide used historically for dermatitis herpetiformis and as a component in dapsone combinations. As a separate chemically defined organic compound not covered by specific prior subheadings, it falls under HTS 2935.90.95.00.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If containing heterocyclic ring prioritized over sulfonamide
Chapter notes prioritize last occurring heading; certain heterocycles may supersede.
If in pesticide/herbicide formulation
Sulfonamides used as agricultural chemicals classify in Chapter 38.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Legacy antibiotic; provide historical monograph references (USP/NF)
• Research chemical imports need end-user statement to avoid diversion
Related Products under HTS 2935.90.95.00
Sulfisoxazole Diolamine
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.
Mefenamic Acid
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.
Celecoxib API
Celecoxib is a COX-2 selective NSAID containing a sulfonamide group, used for arthritis treatment. Classified under HTS 2935.90.95.00 due to its pyrazole-sulfonamide structure qualifying as an 'Other' sulfonamide.
Sulfanilamide
Sulfanilamide is the parent compound of all sulfonamide antibiotics, historically significant for treating streptococcal infections. As the simplest sulfonamide not covered by prior specific subheadings, it classifies under HTS 2935.90.95.00.
Acetazolamide
Acetazolamide is a carbonic anhydrase inhibitor sulfonamide used for glaucoma, altitude sickness, and epilepsy. Its benzothiazole-sulfonamide structure places it in HTS 2935.90.95.00 as an 'Other' sulfonamide.
Furosemide
Furosemide is a loop diuretic containing a furfuryl-sulfonamide structure, used for edema and hypertension. Classified under HTS 2935.90.95.00 as a sulfonamide derivative despite primary diuretic function.