Isoniazid (Pyridine-4-Carboxylic Acid Hydrazide) from China
Isoniazid is a first-line antituberculosis drug featuring a pyridine carboxylic acid hydrazide structure. Classified in HTS 2933.39.41.00 as a drug with unfused pyridine ring under Chapter 29 heterocyclic provisions. Essential medicine status requires high purity bulk import form.
Duty Rate — China → United States
100%
Rate breakdown
9903.04.6093.5%Pharmaceuticals: patented pharma articles — 100% floor rate
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
• Include International Nonproprietary Name (INN) certificate and TB treatment end-use letter
• Hydrazide purity testing critical; impurities >1% may reclassify
• Controlled substance monitoring may apply; check DEA import requirements