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Isradipine from Mexico

Isradipine, a 1,4-dihydropyridine derivative, selectively blocks L-type calcium channels for hypertension therapy. Its nitrogen-heterocyclic aromatic structure fits HTS 2933.99.53.00 as a cardiovascular drug API. Typically imported as micronized powder for tablet coating.

Duty Rate — Mexico → United States

16.5%

Rate breakdown

9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico

Import Tips

D50 particle size 5-15μm critical - include laser diffraction report

Photostability testing required due to yellowing tendency

Single-source API often - verify supplier DMF status with FDA