Succinylsulfathiazole from Canada
Succinylsulfathiazole is a poorly absorbed sulfonamide designed for intestinal infections, releasing active sulfathiazole locally. Classified HTS 2935.90.4800 as sulfonamide anti-infective per Chapter 29 ester classification rules. Used in ulcerative colitis and bacillary dysentery treatment.
Duty Rate — Canada → United States
16.5%
Rate breakdown
9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
Import Tips
• Include in vitro release profile data confirming colonic activation mechanism
• Purity >98% required; succinic acid impurities trigger mixture classification
• Document non-systemic absorption profile distinguishing from systemic sulfonamides