Aminophylline USP Powder from Canada
Aminophylline is a heterocyclic compound containing a xanthine (purine) structure with pyrimidine rings, used as a bronchodilator for asthma treatment. It falls under HTS 2933.59.59.00 as a drug featuring pyrimidine heteroatoms not specified elsewhere in the subheading. This classification applies to its pure chemical form for pharmaceutical use.
Duty Rate — Canada → United States
100%
Rate breakdown
9903.04.6096.3%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 FDA Drug Master File and Certificate of Analysis confirming USP purity and pyrimidine structure to avoid reclassification
• Ensure shipments include stability data as required for temperature-sensitive pharmaceuticals to prevent duty disputes
• Declare exact isomer content; mixtures may shift to earlier headings per Chapter 29 note 3(b)