Aminophylline USP Powder from Mexico
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 — Mexico → United States
3.7%
Rate breakdown
9903.03.030%Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter
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)