Emedastine (fumarate)

Emedastine is a histamine H1 receptor antagonist (Ki = 1.3 nM). It is selective for histamine H1 over H2 and H3 receptors (Kis = 49 and 12.43 µM, respectively), as well as alpha1-, alpha2-, and beta1-adrenergic and dopamine D1 and D2 receptors, and the serotonin (5-HT) receptor subtypes 5-HT1 and 5-HT2 at 10 µM. Emedastine inhibits histamine-induced phosphoinositide turnover and intracellular calcium mobilization in primary human conjunctival epithelial cells (HCECs, IC50s = 1.6 and 2.9 nM, respectively). It also inhibits histamine-stimulated secretion of IL-6, IL-8, and GM-CSF by primary HCECs (IC50s = 2.23, 3.42, and 1.50 nM, respectively). Ocular application of emedastine prior to histamine challenge inhibits vascular permeability in guinea pigs. Formulations containing emedastine have been used in the treatment of allergic conjunctivitis.Formal Name: 1-(2-ethoxyethyl)-2-(hexahydro-4-methyl-1H-1,4-diazepin-1-yl)-1H-benzimidazole, 2E-butenedioate (1:2). CAS Number: 87233-62-3. Synonyms: AL 3432A, LY188695. Molecular Formula: C17H26N4O . 2C4H4O4. Formula Weight: 534.6. Purity: >98%. Formulation: (Request formulation change), A solid. Solubility: DMSO: Slightly Soluble, Methanol: Slightly Soluble. SMILES: CN(CC1)CCCN1C2=NC3=CC=CC=C3N2CCOCC.OC(/C=C/C(O)=O)=O.OC(/C=C\C(O)=O)=O. InChi Code: InChI=1S/C17H26N4O.2C4H4O4/c1-3-22-14-13-21-16-8-5-4-7-15(16)18-17(21)20-10-6-9-19(2)11-12-20,2*5-3(6)1-2-4(7)8/h4-5,7-8H,3,6,9-14H2,1-2H3,2*1-2H,(H,5,6)(H,7,8)/b,2*2-1+. InChi Key: FWLKKPKZQYVAFR-LVEZLNDCSA-N.