Astemizole (formerly R-43512; Hismanal) is a novel, potent and second-generation antihistamine drug with a long duration of action and is used to diminish allergic symptomsby acting as a histamine H1-receptor antagonist (IC50 = 4 nM).

Roxatidine Acetate HCl (HOE-760; TZU0460; HOE760; TZU-0460; Gastralgin; Altat; Roxit), the hydrochloride salt of Roxatidine Acetate, is a specific and competitive histamin H2-receptor antagonist with antiulcer activity.

Histamine phosphate (Histamine diphosphate), the diphosphate salt of histamine, is an imidazole-based organic compound acts by stimulating Histamine 1/2 receptors.

NSC19005 (Betahistine EP Impurity C) is an impurity of Betahistine and is structurally related to Betahistine.

Ciproxifan (FUB 359; FUB-359; FUB359) is a highly potent and selective histamine H3-receptor antagonist used for treatment of cognitive deficiencies and other disorders of the central nervous system.

Psoralenoside is a novel and potent naturally compound.

Emedastine is a novel, potent, high affinity, selective, second generation H1-receptor antagonist with pre-clinically well-documented anti-allergic effects.

VUF10460 is a non-imidazole agonist of the histamine H4 receptor which binds to rat H4 receptor with a pKi of 7.46.

Conessine is a naturally occurring, steroidal alkaloid extracted from a number of plant species from the family Apocynaceae, including Holarrhena floribunda, Holarrhena antidysenterica and Funtumia elastica.

Azelastine HCl (Allergodil; Astelin; Optivar; Rhinolast; Azeptin), the hydrochloride salt of azelastine, is a potent, 2nd-generation, and selective histamine receptor antagonist used for the treatment of rhinitis.