Nifedipine from China
Nifedipine is the prototype dihydropyridine calcium channel blocker used for angina and hypertension. This nitro-substituted aromatic heterocycle with nitrogen hetero-atoms classifies under HTS 2933.99.53.00. Bulk API imported under nitrogen atmosphere due to light sensitivity.
Duty Rate — China → United States
19%
Rate breakdown
9903.05.3112.5%Section 301 (forced labor) — additional 12.5% ad valorem on products of China
Import Tips
• Amber glass or opaque HDPE only - light exposure converts to nitroso derivative
• Polymorph I required for bioavailability - Form II dissolves slower
• High potency Category 3 - dedicated equipment cleaning validation needed