HistamineReceptors, Histamine H1Histamine ReleaseReceptors, Histamine H2Receptors, HistamineHistamine AntagonistsHistamine AgonistsHistamine H1 AntagonistsReceptors, Histamine H3Histamine H2 AntagonistsHistamine N-MethyltransferasePyrilamineMethylhistaminesHistidine DecarboxylaseDimapritHistamine H3 AntagonistsHistamine AgentsCimetidineChlorpheniramineMetiamideDiphenhydramineMast Cellsp-Methoxy-N-methylphenethylamineBasophilsImpromidineThioureaGuinea PigsAnaphylaxisBurimamideHistamine H1 Antagonists, Non-SedatingBronchial Provocation TestsRanitidineTropaeolaceaeTriprolidineImmunoglobulin EDose-Response Relationship, DrugCromolyn SodiumPruritusStereoisomerismTerfenadineFamotidineAmine Oxidase (Copper-Containing)Gastric JuiceGastric MucosaSRS-AGastric AcidCetirizineMethacholine CompoundsPentagastrinKetotifenTripelennamineBronchiAnti-Allergic AgentsMuscle, SmoothAirway ResistanceMagnetic Resonance SpectroscopyBronchoconstrictionTracheaEnterochromaffin-like CellsMolecular StructureMethylhistidinesCells, CulturedNucleic Acid ConformationPassive Cutaneous AnaphylaxisModels, MolecularGastrinsMolecular ConformationSerotoninPiperidinesMucunaStomachMuscle ContractionPlant ExtractsNasal Provocation TestsCapillary PermeabilityBronchial SpasmBradykininImidazolesStimulation, ChemicalAsthmaHypersensitivityTime FactorsAntibodies, MonoclonalGastric FistulaParietal Cells, GastricHydrogen BondingHypersensitivity, ImmediateClemastineEnterochromaffin CellsAtropineRats, WistarRabbitsGuanineUrticariaAstemizoleInjections, IntradermalHeterocyclic Compounds, Bridged-RingGuanidinesCyclic AMPIleum