Sildenafil Citrate API
Sildenafil citrate, the active ingredient in Viagra, contains a pyrazolo[4,3-d]pyrimidine structure but classifies under unfused pyrazole HTS 2933.19.3500 as a pharmaceutical drug. Used for erectile dysfunction and pulmonary hypertension treatment.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If purine/pyrimidine ring emphasized
Fused pyrimidine characteristics may classify under other nitrogen heterocycles.
If immunological hormone modifier
PDE5 inhibitors with hormonal effects could fall under immunological products.
If carboxamide function predominates
Amide group classification possible if heterocyclic nature secondary.
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Import Tips & Compliance
• Verify citrate salt formation per note 5(C)(1); provide counterion analysis
• Include polymorph Form I certificate; FDA bioequivalence data required
• Prevent 3004 misclassification with 'Bulk API - Not for Direct Human Use' labeling
Related Products under HTS 2933.19.35.00
Celecoxib Active Pharmaceutical Ingredient
Celecoxib is a selective COX-2 inhibitor used in nonsteroidal anti-inflammatory drugs for pain relief and arthritis treatment. It contains an unfused pyrazole ring in its aromatic heterocyclic structure, classifying it under HTS 2933.19.3500 as a drug. This API is imported for pharmaceutical formulation.
Rimegepant API
Rimegepant is a calcitonin gene-related peptide receptor antagonist used for acute migraine treatment. Its core structure features an aromatic pyrazole ring, qualifying under HTS 2933.19.3500 for pyrazole drugs. Imported as high-purity bulk powder for tablet manufacturing.
Fipronil Technical Grade
Fipronil is a broad-spectrum insecticide with a substituted pyrazole ring in its aromatic heterocyclic structure. Classified as a drug under HTS 2933.19.3500 when imported as technical material for veterinary/agricultural pharmaceutical formulations. Used in flea/tick treatments and crop protection.
Zaleplon API
Zaleplon is a non-benzodiazepine hypnotic containing an acetylaminopyrazole structure, imported as a drug under HTS 2933.19.3500. Used for short-term insomnia treatment with pyrazole as the core heterocyclic pharmacophore.
Rabeprazole Sodium API
Rabeprazole sodium, a proton pump inhibitor for GERD treatment, features a substituted 2-pyridylmethylsulfinyl benzimidazole but retains pyrazole classification under HTS 2933.19.3500 when pyrazole motif dominates. Imported for tablet production.
Viagra Generic API (Sildenafil Base)
Pharmaceutical-grade sildenafil base (non-citrate form) for generic erectile dysfunction medications contains unfused pyrazole ring structure under HTS 2933.19.3500. Bulk imported for salt formation and tablet compression.