title: Inhibition by azelastine of the immunologically induced histamine release from isolated guinea pig mast cells.
abstract: 4-(p-Chlorobenzyl)-2-(hexahydro-1-methyl-1H-azepin-4-yl)-1-(2H)-phthalazinone (azelastine, A 5610) did not affect the spontaneous histamine release but inhibited effectively the allergic histamine release from isolated mesenteric mast cells of actively sensitized guinea pigs. At 10(-6) mol/l concentration the inhibition was almost equal to that caused by adrenaline (10(-8) mol/l).
mesh_terms: D000818:Animals; D004837:Epinephrine / Q000494:pharmacology; D006168:Guinea Pigs; D006634:Histamine H1 Antagonists / Q000494:pharmacology*; D006636:Histamine Release / Q000187:drug effects*; D066298:In Vitro Techniques; D008297:Male; D008407:Mast Cells / Q000378:metabolism*; D010793:Phthalazines / Q000494:pharmacology*; D011724:Pyridazines / Q000494:pharmacology*
chemical_list: D006634:Histamine H1 Antagonists; D010793:Phthalazines; D011724:Pyridazines; D004837:Epinephrine; C020976:azelastine