Receptors, Histamine H3Histamine AntagonistsHistamine AgonistsReceptors, Histamine H1HistamineReceptors, Histamine H2Receptors, HistamineHistamine H3 AntagonistsMethylhistaminesHistamine H1 AntagonistsHistamine H2 AntagonistsIsothiuroniumHistamine AgentsDimapritPiperidinesHistamine ReleaseThioureaCimetidinePyrilamineImpromidineChlorpheniramineBetahistineBurimamideImidazolesRanitidineMetiamideGuinea PigsRadioligand AssayDiphenhydramineHistamine N-MethyltransferaseFamotidineHistidine DecarboxylaseDose-Response Relationship, DrugReceptors, G-Protein-CoupledHistamine H1 Antagonists, Non-SedatingDoxepinKindling, NeurologicRats, WistarIleumPentylenetetrazoleTripelennamineCerebral Cortexp-Methoxy-N-methylphenethylamineTriprolidineTerfenadineGastric AcidMast CellsKetotifenDibenzoxepinsPruritusCetirizineGuanidinesGastric MucosaAnaphylaxisAnticonvulsantsRats, Sprague-DawleyDibenzazepinesDimethindeneBasophilsNizatidineAstemizoleDrug Inverse AgonismGastric JuiceMuscle, SmoothAnti-Allergic AgentsPentagastrinCyproheptadinePheniraminePromethazineStomachMethacholine CompoundsSneezingPhenoxypropanolaminesGastrinsHypothalamic Area, LateralCyclic AMPTracheaParietal Cells, GastricBinding, CompetitiveButyrophenonesMuscle ContractionBenztropine