title: Hypersensitivity reactions.
mesh_terms: D001327:Autoimmune Diseases / Q000209:etiology; D004342:Drug Hypersensitivity / Q000276:immunology*; D064420:Drug-Related Side Effects and Adverse Reactions; D006801:Humans; D006830:Hydralazine / Q000009:adverse effects
chemical_list: D006830:Hydralazine