Receptors, Histamine H3Receptors, Histamine H1HistamineReceptors, Histamine H2Histamine H1 AntagonistsHistamine AgonistsReceptors, HistamineHistamine H2 AntagonistsHistamine AntagonistsHistamine H3 AntagonistsHistamine ReleaseMethylhistaminesChlorpheniramineDimapritCimetidineMetiamideThioureaImpromidineDiphenhydramineHistamine N-MethyltransferaseHistamine AgentsFamotidineRanitidineHistidine DecarboxylaseBurimamidePyrilamineHistamine H1 Antagonists, Non-SedatingDoxepinGuinea PigsIsothiuroniumTripelennaminePiperidinesp-Methoxy-N-methylphenethylamineTriprolidineTerfenadineImidazolesGastric AcidMast CellsKetotifenDibenzoxepinsReceptors, G-Protein-CoupledBetahistineRadioligand AssayPruritusDose-Response Relationship, DrugCetirizineGuanidinesGastric MucosaAnaphylaxisDibenzazepinesDimethindeneBasophilsNizatidineAstemizoleDrug Inverse AgonismGastric JuiceMuscle, SmoothAnti-Allergic AgentsPentagastrinCyproheptadinePheniraminePromethazineStomachMethacholine CompoundsSneezingPhenoxypropanolaminesGastrinsHypothalamic Area, LateralRats, WistarIleumCyclic AMPTracheaParietal Cells, GastricBinding, CompetitiveButyrophenonesMuscle ContractionBenztropineToluene 2,4-DiisocyanateEnterochromaffin CellsBronchial Provocation TestsIndolesStimulation, ChemicalBronchiImmunoglobulin ECromolyn SodiumCapillary PermeabilityDrug InteractionsPyridinesDogsSerotoninPiperazinesHistoryBethanechol CompoundsAmine Oxidase (Copper-Containing)Inositol PhosphatesBenzazepinesSRS-ACricetinaeMaprotilineCells, Cultured