Antihistamines, including those principally used as anti-nauseants
Heterocyclic compounds with nitrogen hetero-atom(s) only: > Compounds containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure: > Other: > Drugs: > Aromatic or modified aromatic: > Antihistamines, including those principally used as anti-nauseants
Duty Rate (from China)
Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter
Products classified under HTS 2933.59.21.00
Promethazine Hydrochloride
Promethazine hydrochloride is a first-generation antihistamine and phenothiazine derivative containing a modified aromatic pyrimidine-like structure, primarily used to treat motion sickness, nausea, and allergic reactions. It falls under HTS 2933.59.21.00 as an aromatic antihistamine principally used as an anti-nauseant, consistent with chapter notes for heterocyclic nitrogen compounds with pyrimidine rings. This chemically defined compound is imported in pure form for pharmaceutical formulation.
Cyclizine Hydrochloride
Cyclizine hydrochloride is a piperazine-based antihistamine used mainly for preventing motion sickness and treating vertigo/nausea. Its heterocyclic structure with piperazine ring qualifies it under HTS 2933.59.21.00 as an aromatic antihistamine anti-nauseant. Chapter notes confirm classification for separate chemically defined compounds with nitrogen hetero-atoms.
Buclizine Hydrochloride
Buclizine hydrochloride, a piperazine antihistamine, treats nausea, vomiting, and motion sickness with antiemetic properties. Classified under HTS 2933.59.21.00 for its aromatic heterocyclic structure containing piperazine ring, as a drug principally used as anti-nauseant. Meets chapter definition for separate organic compounds with nitrogen hetero-atoms.
Meclizine Hydrochloride
Meclizine hydrochloride is a piperazine antihistamine primarily indicated for motion sickness prevention and vertigo treatment. Its modified aromatic structure with piperazine qualifies for HTS 2933.59.21.00 as an anti-nauseant drug. Chapter notes support classification of such chemically defined pharmaceuticals.
Dimenhydrinate
Dimenhydrinate is the aminophylline salt of diphenhydramine, functioning as an antihistamine antiemetic for motion sickness. Despite salt form, classified with the organic base under HTS 2933.59.21.00 per chapter note C(1) for aromatic pyrimidine-related antihistamines. Used principally as anti-nauseant.
Hydroxyzine Hydrochloride
Hydroxyzine hydrochloride, a piperazine antihistamine, treats anxiety, itching, and nausea pre-surgery. Falls under HTS 2933.59.21.00 for aromatic heterocyclic drugs principally used as antihistamines/anti-nauseants. Chemically defined per chapter (a) with stabilizer allowances.
Chlorpheniramine Maleate
Chlorpheniramine maleate is an alkylamine antihistamine with modified aromatic structure used for allergies and sometimes nausea. Imported under HTS 2933.59.21.00 as it qualifies among aromatic antihistamines per subheading scope. Chapter notes allow salt classification with acid/base.
Doxylamine Succinate
Doxylamine succinate, an ethanolamine antihistamine, primarily treats nausea in pregnancy and insomnia. Its pyrimidine-containing structure fits HTS 2933.59.21.00 for anti-nauseant aromatic drugs. Qualifies as chemically defined salt per chapter notes.
Diphenhydramine Citrate
Diphenhydramine citrate salt serves as an antihistamine for allergies and anti-nauseant in motion sickness. Aromatic with pyrimidine elements, under HTS 2933.59.21.00 per drug subheading. Chapter C(1) places salts with organic compound.
Clemastine Fumarate
Clemastine fumarate is a second-generation antihistamine with anti-nauseant applications in allergy treatment. Modified aromatic heterocyclic structure under HTS 2933.59.21.00. Fits chapter for drugs with nitrogen hetero-atoms.
Brompheniramine Maleate
Brompheniramine maleate treats allergic rhinitis and nausea with antihistamine action. Aromatic propylamine derivative with pyrimidine affinity under HTS 2933.59.21.00. Chemically pure drug per chapter scope.
Triprolidine Hydrochloride
Triprolidine hydrochloride is an antihistamine for colds and nausea prevention. Piperazine-related aromatic under HTS 2933.59.21.00. Meets all chapter purity criteria.
Cyproheptadine Hydrochloride
Cyproheptadine hydrochloride, piperidine antihistamine, used for allergies and nausea. Aromatic heterocyclic drug HTS 2933.59.21.00.
Pheniramine Maleate
Pheniramine maleate antihistamine for rhinitis/nausea. Aromatic pyrimidine-type HTS 2933.59.21.00.
Dexchlorpheniramine Maleate
Dexchlorpheniramine maleate, enantiomer antihistamine anti-nauseant. HTS 2933.59.21.00 aromatic drug.