Tolpropamine Hydrochloride from China
Tolpropamine hydrochloride is an antihistamine containing aromatic amine functionality used for allergy relief. Classified under HTS 2921.49.43.00 as a pharmaceutical drug. Features diphenylmethylamine structure typical of first-generation antihistamines.
Duty Rate — China → 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 stability studies for antihistamine formulations
• Verify compliance with FDA OTC monograph if applicable
• Document impurity profile per ICH guidelines