Sildenafil Citrate API from Japan
Sildenafil citrate, the active ingredient in Viagra, contains a pyrazole ring within its heterocyclic structure for erectile dysfunction treatment. Falls under HTS 2933.19.4500 as a pyrazole-containing drug per Chapter 29 chemical classification rules. Supplied as bulk powder for tablet formulation.
Duty Rate — Japan → 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
• Include FDA-approved DMF and polymorphic form specifications; citrate salt must match USP monograph
• Declare exact purity (≥98.5%) and provide HPLC chromatograms confirming pyrazole integrity