Receptors, Histamine H3Histamine AgonistsReceptors, Histamine H1Receptors, Histamine H2Receptors, HistamineHistamineHistamine AntagonistsHistamine H1 AntagonistsMethylhistaminesHistamine H2 AntagonistsPyrilamineHistamine H3 AntagonistsHistamine N-MethyltransferaseReceptors, G-Protein-CoupledRadioligand AssayHistamine ReleaseChlorpheniramineLigandsDimapritCimetidineImidazolesMetiamideThioureaImpromidineDiphenhydramineFamotidineHistamine AgentsRanitidinePiperidinesBurimamideGuinea PigsHistidine DecarboxylaseHistamine H1 Antagonists, Non-SedatingDoxepinIsothiuroniumDose-Response Relationship, DrugTripelennamineMolecular Sequence Datap-Methoxy-N-methylphenethylamineTerfenadineTriprolidineGastric AcidMast CellsHormone AntagonistsKetotifenDibenzoxepinsNeurokinin-1 Receptor AntagonistsDopamine AntagonistsRats, WistarRats, Sprague-DawleyExcitatory Amino Acid AntagonistsBetahistinePruritusGuanidinesCetirizineNarcotic AntagonistsGastric MucosaBinding, CompetitiveMuscle, SmoothInterleukin 1 Receptor Antagonist ProteinMuscarinic AntagonistsDibenzazepinesAnaphylaxisDrug Inverse AgonismNizatidineCyproheptadineAstemizoleIndolesPyridinesGABA AntagonistsMuscle ContractionDrug InteractionsDimethindenePurinergic P1 Receptor AntagonistsCyclic AMPBasophilsBenzazepinesPiperazinesGastric JuicePentagastrinAnti-Allergic AgentsCells, CulturedIleumSerotoninNicotinic AntagonistsStomachPheniramineAdenosine A2 Receptor AntagonistsTracheaPromethazineAdrenergic alpha-1 Receptor AntagonistsPurinergic P2 Receptor AntagonistsSubstance PGastrinsTime FactorsMethacholine CompoundsBradykininPhenoxypropanolaminesSerotonin 5-HT3 Receptor AntagonistsLeukotriene Antagonists