Sildenafil Citrate API
Sildenafil citrate, the active ingredient in Viagra, contains a pyrazole ring within its heterocyclic structure for erectile dysfunction treatment. Falls under HTS 2933.19.4500 as a pyrazole-containing drug per Chapter 29 chemical classification rules. Supplied as bulk powder for tablet formulation.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If for other unfused nitrogen heterocyclic drugs without pyrazole
Specific pyrazole subheading 2933.19.45 takes precedence over general 2933.99 per classification note 3
If imported as film-coated tablets rather than powder
Dosage forms regardless of pyrazole content classify in Chapter 30 for medicaments
If pyrazole contains organo-sulfur directly linked to carbon
Organo-sulfur pyrazoles shift to Chapter 29 heading 2930 per exclusion notes
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Import Tips & Compliance
• Include FDA-approved DMF and polymorphic form specifications; citrate salt must match USP monograph
• Declare exact purity (≥98.5%) and provide HPLC chromatograms confirming pyrazole integrity
Related Products under HTS 2933.19.45.00
Celecoxib API
Celecoxib is a selective COX-2 inhibitor used as the active pharmaceutical ingredient in anti-inflammatory drugs like Celebrex for treating arthritis. It contains an unfused pyrazole ring in its heterocyclic structure, qualifying it under HTS 2933.19.4500 as a pyrazole-based drug. This classification applies to pure chemical compounds intended for pharmaceutical use.
Rizatriptan Benzoate API
Rizatriptan benzoate is the active ingredient in Maxalt for migraine treatment, featuring a pyrazole ring in its structure. Classified under HTS 2933.19.4500 as a drug containing unfused pyrazole ring per Chapter 29 notes. Used primarily as a serotonin receptor agonist in pharmaceutical manufacturing.
Fomepizole API
Fomepizole is an antidote for ethylene glycol/methanol poisoning, featuring a simple 4-methylpyrazole structure. Classified under HTS 2933.19.4500 as a pyrazole ring drug for emergency medical use. Provided as sterile injectable-grade API.
Aminaphtone API
Aminaphtone is a pyrazole derivative used for capillary fragility treatment in vascular disorders. Features 4-amino-3-methyl-1-phenylpyrazol-5-one structure qualifying under HTS 2933.19.4500. Pharmaceutical grade for tablet manufacturing.
Metamizole Sodium API
Metamizole sodium (dipyrone) contains pyrazole ring as analgesic/antipyretic active ingredient. Classifies under HTS 2933.19.4500 as pyrazole drug despite sodium salt form per Chapter note 5(C). Used globally for pain relief.
Zaleplon API
Zaleplon, active in Sonata sleep aid, contains pyrazole ring as core structure for non-benzodiazepine hypnotic action. HTS 2933.19.4500 classification for unfused pyrazole drugs. Bulk API for capsule production.