title: Histamine, H1 and H2 antihistamines, and immediate hypersensitivity reactions.
mesh_terms: D000818:Animals; D000937:Antigen-Antibody Reactions; D002199:Capillary Permeability; D004285:Dogs; D006168:Guinea Pigs; D000882:Haplorhini; D006632:Histamine / Q000494:pharmacology*; D006634:Histamine H1 Antagonists / Q000627:therapeutic use; D006635:Histamine H2 Antagonists / Q000627:therapeutic use; D006801:Humans; D006967:Hypersensitivity / Q000188:drug therapy; D006969:Hypersensitivity, Immediate / Q000276:immunology*; D007073:Immunoglobulin E; D009119:Muscle Contraction; D009130:Muscle, Smooth
chemical_list: D006634:Histamine H1 Antagonists; D006635:Histamine H2 Antagonists; D007073:Immunoglobulin E; D006632:Histamine