Receptors, Histamine H3Receptors, Histamine H1HistamineReceptors, Histamine H2Histamine H1 AntagonistsHistamine AgonistsHistamine H2 AntagonistsReceptors, HistamineHistamine AntagonistsHistamine H3 AntagonistsHistamine ReleaseMethylhistaminesChlorpheniramineDimapritCimetidineMetiamideThioureaImpromidineDiphenhydramineFamotidineHistamine N-MethyltransferaseHistamine AgentsRanitidinePyrilaminePiperidinesBurimamideGuinea PigsHistidine DecarboxylaseHistamine H1 Antagonists, Non-SedatingDoxepinIsothiuroniumDose-Response Relationship, DrugTripelennamineRadioligand Assayp-Methoxy-N-methylphenethylamineTerfenadineTriprolidineGastric AcidReceptors, G-Protein-CoupledMast CellsImidazolesHormone 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 AntagonistsLigandsSubstance PGastrinsTime FactorsMethacholine CompoundsBradykininPhenoxypropanolaminesSerotonin 5-HT3 Receptor AntagonistsLeukotriene AntagonistsCricetinae