Histamine ReleaseMast CellsHistamineReceptors, Histamine H3Receptors, Histamine H1Receptors, Histamine H2Histamine H1 AntagonistsHistamine AgonistsHistamine H2 AntagonistsReceptors, HistamineHistamine AntagonistsHistamine H3 AntagonistsMethylhistaminesChlorpheniramineDimapritCimetidineCell Degranulationp-Methoxy-N-methylphenethylamineMetiamideThioureaDiphenhydramineImpromidinePyrilamineHistidine DecarboxylaseFamotidineHistamine N-MethyltransferaseHistamine AgentsTryptasesRanitidinePiperidinesGuinea PigsChymasesBurimamideReceptors, IgEHistamine H1 Antagonists, Non-SedatingImmunoglobulin EKetotifenDose-Response Relationship, DrugDoxepinAnaphylaxisIsothiuroniumCromolyn SodiumBasophilsMastocytosisTripelennamineRadioligand AssayTerfenadineCells, CulturedTriprolidineReceptors, G-Protein-CoupledGastric AcidRats, WistarImidazolesAnti-Allergic AgentsRats, Sprague-DawleyHormone AntagonistsNeurokinin-1 Receptor AntagonistsPassive Cutaneous AnaphylaxisPruritusProto-Oncogene Proteins c-kitDibenzoxepins