Diphenhydramine Hydrochloride from Canada
Diphenhydramine HCl, an ethanolamine derivative with aromatic oxygen-function amino structure, functions as an antihistamine drug. HTS 2922.49.26.00 covers it as an 'other' aromatic amino-acid salt drug. Chapter 29(B) supports ester/alcohol salt placement here.
Duty Rate — Canada → 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
• Provide BP/USP monograph compliance certificate (CAS 147-24-0)
• Declare exact isomer purity to fit Chapter 29(b) mixtures exclusion
• Avoid bulk packaging over 25kg to prevent industrial chemical scrutiny