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Anti-Histamine APIs

H1 receptor antagonists and allergy-adjacent APIs blocking histamine-mediated inflammatory cascades. Supplied in USP/EP/BP grade for tablet, syrup, and injectable formulation manufacturing across allergy product lines.

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All Anti-Histamine APIs

12 APIs available

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CAS 83881-52-1 (HCl) Product Code AHT-001 WHO-GMP

Cetirizine

Second-generation H1 antihistamine supplied as hydrochloride salt — USP/EP/BP grade — for oral tablet and syrup formulation manufacturing. Sourced for allergic rhinitis and chronic urticaria treatment product lines.

USP EP BP Oral

CAS 113-92-8 Product Code AHT-002 WHO-GMP

Chlorpheniramine Maleate

First-generation alkylamine antihistamine in USP grade for tablet and syrup formulation manufacturing. Sourced for allergic conditions, cold symptom relief, and pruritus product lines.

USP Oral

CAS 50-53-3 Product Code AHT-003 WHO-GMP

Chlorpromazine

Phenothiazine with secondary H1-blocking activity, used in antiemetic and sedation formulation manufacturing — USP/EP/BP grade. Note: primary pharmacological class is antipsychotic/neuroleptic, not H1-antihistamine.

USP EP BP

CAS 100643-71-8 Product Code AHT-004 WHO-GMP

Desloratadine

Third-generation non-sedating H1 antihistamine in USP grade for oral tablet and syrup formulation manufacturing. Sourced for allergic rhinitis and chronic urticaria treatment product lines.

USP Oral

CAS 147-24-0 Product Code AHT-005 WHO-GMP

Diphenhydramine HCl

First-generation sedating antihistamine in USP/EP/BP grade for tablet, syrup, and injectable formulation manufacturing. Sourced for allergic reactions, antiemetic, and sleep-aid product lines.

USP EP BP Oral Injection

CAS 153439-40-8 (HCl) Product Code AHT-006 WHO-GMP

Fexofenadine

Non-sedating active terfenadine metabolite supplied as hydrochloride salt — USP grade — for oral tablet formulation manufacturing. Sourced for allergic rhinitis and urticaria treatment product lines.

USP Oral

CAS 34580-14-8 (fumarate) Product Code AHT-007 WHO-GMP

Ketotifen

Non-competitive H1 antagonist and mast cell stabiliser supplied as fumarate salt for tablet and eye-drop formulation manufacturing. Sourced for allergic asthma and allergic conjunctivitis product lines.

Oral Ophthalmic

CAS 130018-87-0 (dihydrochloride) Product Code AHT-008 WHO-GMP

Levocetirizine

R-enantiomer of cetirizine supplied as dihydrochloride salt — USP grade — with enhanced H1 receptor affinity for tablet formulation manufacturing. Sourced for allergic rhinitis and urticaria product lines.

USP Oral

CAS 79794-75-5 Product Code AHT-009 WHO-GMP

Loratadine

Non-sedating piperidine antihistamine in USP/EP/BP grade for oral tablet and syrup formulation manufacturing. Sourced for seasonal and perennial allergic rhinoconjunctivitis treatment product lines.

USP EP BP Oral

CAS 151767-02-1 (sodium) Product Code AHT-010 WHO-GMP

Montelukast

Cysteinyl leukotriene receptor antagonist supplied as sodium salt for tablet formulation manufacturing, often paired with antihistamine product lines. Note: pharmacologically an LTRA, not an H1-antihistamine.

Oral

CAS 132-20-7 Product Code AHT-011 WHO-GMP

Pheniramine Maleate

First-generation alkylamine antihistamine in USP/EP/BP/JP grade for tablet, syrup, and injectable formulation manufacturing. Sourced for allergic rhinitis and urticaria treatment product lines.

USP EP BP JP Oral Injection

CAS 58-33-3 (HCl) Product Code AHT-012 WHO-GMP

Promethazine

Sedating phenothiazine antihistamine supplied as hydrochloride salt — USP/EP/BP grade — for tablet and injectable formulation manufacturing. Sourced for allergy, antiemetic, and pre-operative sedation product lines.

USP EP BP Oral Injection

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