Histamine H1 AntagonistsReceptors, Histamine H1Receptors, Histamine H3HistamineReceptors, Histamine H2Histamine AntagonistsHistamine H1 Antagonists, Non-SedatingHistamine AgonistsReceptors, HistamineHistamine H2 AntagonistsChlorpheniramineHistamine H3 AntagonistsCetirizineLoratadineHistamine ReleaseTerfenadineDiphenhydramineMethylhistaminesUrticariaAstemizoleTriprolidineAnti-Allergic AgentsDibenzoxepinsButyrophenonesDoxepinCimetidineDimapritPyrilamineCyproheptadineMetiamidePruritusRhinitis, Allergic, PerennialKetotifenPromethazineSneezingThioureaHistamine N-MethyltransferaseClemastineImpromidineRhinitis, Allergic, SeasonalPiperidinesHistamine AgentsFamotidineAnaphylaxisRanitidineGuinea PigsHistidine DecarboxylaseBurimamideHydroxyzinePheniramineChenopodium albumDibenzazepinesIsothiuroniumHypersensitivityDimethindeneMast CellsNasal DecongestantsPhenothiazinesDrug HypersensitivityBrompheniramineCyclizineTripelennamineTrimeprazineToluene 2,4-Diisocyanatep-Methoxy-N-methylphenethylamineConjunctivitis, AllergicCromolyn SodiumAngioedemaImidazolesGastric AcidDose-Response Relationship, DrugAntipruriticsConjunctivitisPrurigoNasal ObstructionReceptors, G-Protein-CoupledBetahistineRadioligand AssayAdrenal Cortex HormonesGuanidinesGastric MucosaAdministration, OralDouble-Blind MethodCryptomeriaSleep StagesNonprescription DrugsSkin TestsImmunoglobulin ECommon ColdDermatitis, AtopicRhinitisBasophilsNizatidineCapillary PermeabilityDrug Utilization ReviewNasal MucosaDesensitization, ImmunologicDrug Inverse AgonismAntitussive AgentsGastric Juice