Choline Theophyllinate from Mexico
Salt of choline and theophylline used as a bronchodilator in respiratory medications with improved solubility. Classified under HTS 2923.10.00.00 as choline's salt, taking precedence over the acid component per chapter salt classification rules.
Duty Rate — Mexico → United States
110%
Rate breakdown
9903.04.6096.3%Except as provided in heading 9903.04.61, patented pharmaceutical articles as provided for in subdivisions (c) and (d) of U.S. note 40 to this subchapter
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• Include pharmacological equivalence studies for FDA import review
• Classify bulk API separately from formulated drugs to access correct tariff
• Confirm no excluded additives per chapter notes (e.g
• not for fire extinguishers)