Chlorpheniramine Maleate from Canada
Chlorpheniramine is an aromatic amino-compound with ether oxygen function, an antihistamine. Classified HTS 2922.50.4000 as aromatic oxygen-function amino-compound. Maleate salt follows base per Chapter notes on organic salts.
Duty Rate — Canada → United States
100%
Rate breakdown
9903.04.6093.5%Pharmaceuticals Annex IV: 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
• Provide chiral purity certificates; ensure GMP compliance for pharma intermediates; watch for country-specific antihistamine controls