Theophylline USP Grade from Canada
Theophylline is a methylxanthine drug and bronchodilator, a purine derivative with fused heterocyclic nitrogen rings fitting 2933 classification. Specified in U.S. note 3 to section VI for this subheading. Used in respiratory medications and as chemical intermediate.
Duty Rate — Canada → United States
16.5%
Rate breakdown
9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
Import Tips
• Submit USP certificate and HPLC chromatograms verifying identity and impurity profile
• Declare therapeutic chemical status to prevent misclassification as finished dosage
• Comply with FDA prior notice requirements for bulk pharmaceutical chemicals