Quinidine Sulfate Dihydrate from China
Quinidine sulfate dihydrate is the principal antiarrhythmic salt form of quinidine from cinchona, used in oral solid dosage forms. Falls under HTS 2939.20.0050 as other cinchona derivatives. Pharmaceutical grade with defined hydrate.
Duty Rate — China → United States
100%
Rate breakdown
9903.04.60100%Pharmaceuticals Annex IV: patented pharma articles — 100% floor rate
9903.05.860%Universal product exemption (U.S. note 52(b))
9903.05.900%Articles already subject to Section 232 (steel/aluminum/copper + derivatives, autos + parts, wood, medium/heavy vehicles + parts, semiconductors, patented pharma) — U.S. note 52(f)
Import Tips
• Certificate must specify dihydrate water content (9-10.5%)
• Provide polymorphic form identification (Form I vs II)
• Include microbial limits testing for oral grade API