Succinylsulfathiazole from Mexico
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 — Mexico → United States
100%
Rate breakdown
9903.04.6093.5%Pharmaceuticals: patented pharma articles — 100% floor rate
9903.05.900%Articles already subject to Section 232 (steel/aluminum/copper + derivatives, autos + parts, wood, medium/heavy vehicles + parts, semiconductors, patented pharma) — U.S. note 52(f)
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