Cimetidine Base
Cimetidine is an imidazole-containing histamine H2-receptor antagonist used to treat peptic ulcers and GERD. As a bulk pharmaceutical chemical with unfused imidazole ring, it falls under HTS 2933.29.90.00 for other heterocyclic compounds with nitrogen hetero-atoms only.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the imidazole functionality is part of a fused ring system
Fused imidazole derivatives classified later in numerical order per Chapter 29 note 3.
If for mixtures containing cimetidine as active ingredient
Medicinal mixtures with specific activity fall under Chapter 30 even if chemically definable.
If imported as research chemical mixture with excipients
Complex mixtures not purely chemically defined may classify as chemical preparations.
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
• Include spectral analysis (NMR, IR) confirming imidazole ring presence for Customs verification
• Register as bulk drug substance with FDA prior to import to avoid detention
• Label containers with CAS number 51481-61-9 and 'For Manufacturing Use Only' to prevent retail classification
Related Products under HTS 2933.29.90.00
Metronidazole USP
Metronidazole is a synthetic nitroimidazole derivative used primarily as an antibiotic for treating anaerobic bacterial and protozoal infections. It contains an unfused imidazole ring in its structure, qualifying it under HTS 2933.29.90.00 as a heterocyclic compound with nitrogen hetero-atoms only, specifically other unfused imidazole ring compounds.
4-Nitroimidazole
4-Nitroimidazole serves as a synthetic intermediate for nitroimidazole antibiotics like metronidazole. Its unfused imidazole ring with nitro substitution places it under HTS 2933.29.90.00 as other nitrogen-heterocyclic compounds.
Histamine Dihydrochloride
Histamine dihydrochloride, containing imidazole ring, used in pharmaceutical standards and research. Falls under HTS 2933.29.90.00 as a chemically defined compound with unfused imidazole ring and nitrogen hetero-atoms.
2-Methylimidazole
2-Methylimidazole is an alkyl-substituted imidazole used as curing agent in epoxy resins and pharmaceutical intermediate. Classified under HTS 2933.29.90.00 for unfused imidazole ring compounds.
Clotrimazole USP
Clotrimazole is an imidazole antifungal agent containing unfused imidazole ring in its structure. Bulk API form classifies under HTS 2933.29.90.00 as other heterocyclic nitrogen compounds.
Miconazole Nitrate
Miconazole nitrate, an imidazole antifungal, contains unfused imidazole ring as key pharmacophore. The nitrate salt classifies with parent base under HTS 2933.29.90.00 per chapter salt rules.