Receptors, Histamine H3Histamine AgonistsHistamine AntagonistsHistamine H3 AntagonistsReceptors, Histamine H2MethylhistaminesHistamineReceptors, HistamineReceptors, Histamine H1Histamine H1 AntagonistsHistamine H2 AntagonistsThioureaHistamine ReleaseChlorpheniramineDimapritCimetidineMetiamideImpromidineDiphenhydramineFamotidineHistamine 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 AMPBasophilsBenzazepinesPiperazines