Receptors, Histamine H3Receptors, Histamine H1HistamineReceptors, Histamine H2Histamine H1 AntagonistsHistamine AgonistsHistamine H2 AntagonistsReceptors, HistamineHistamine AntagonistsHistamine H3 AntagonistsHistamine ReleaseMethylhistaminesParietal Cells, GastricChlorpheniramineDimapritCimetidineParietal BoneMetiamideThioureaImpromidineDiphenhydramineFamotidineHistamine N-MethyltransferaseRanitidineHistamine AgentsPyrilaminePiperidinesHistidine DecarboxylaseGuinea PigsBurimamideHistamine H1 Antagonists, Non-SedatingGastric AcidDoxepinDose-Response Relationship, DrugIsothiuroniumGastric MucosaTripelennamineRadioligand Assayp-Methoxy-N-methylphenethylamineTerfenadineTriprolidineReceptors, G-Protein-CoupledImidazolesBrain MappingBrainMast CellsHormone AntagonistsKetotifenRats, WistarMagnetic Resonance ImagingRats, Sprague-DawleyAminopyrineH(+)-K(+)-Exchanging ATPaseDibenzoxepinsNeurokinin-1 Receptor AntagonistsDopamine AntagonistsExcitatory Amino Acid AntagonistsCerebral CortexBetahistineStomachPruritusGuanidinesCetirizineNarcotic AntagonistsGastric JuiceBinding, CompetitivePentagastrinMuscle, SmoothInterleukin 1 Receptor Antagonist ProteinMuscarinic AntagonistsDibenzazepinesAnaphylaxisFunctional LateralityDrug Inverse AgonismTime FactorsPyridinesFrontal LobeIndolesPsychomotor PerformanceNizatidineCyproheptadineCyclic AMPAstemizoleCells, CulturedGABA AntagonistsDrug InteractionsMuscle ContractionDimethindenePurinergic P1 Receptor AntagonistsBasophilsBenzazepinesPiperazinesSerotoninAnti-Allergic AgentsIleumDogsNeuronsCarbacholNicotinic AntagonistsPheniramine