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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If non-drug veterinary use or research grade
Pyrazole compounds without pharmaceutical drug status classify under other non-drug provisions.
If formulated as insecticide with >1% active ingredient
Pesticide products in forms for retail sale move to Chapter 38.
If organosulfur pyrazole predominates
Sulfur directly linked to pyrazole carbon classifies as organo-sulfur compound.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Provide EPA registration and FIFRA compliance documentation for pesticide drug import
• Include LC50 toxicity data and purity certificate (>95% ai) confirming pyrazole structure
• Segregate from 3808 formulations; bulk technical stays in Chapter 29
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.
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.
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.