title: Don't take echinacea if you're allergic to ragweed.
mesh_terms: D000485:Allergens / Q000276:immunology; D031164:Ambrosia / Q000276:immunology*; D003139:Common Cold / Q000628:therapy; D000075202:Contraindications; D003429:Cross Reactions / Q000276:immunology*; D004342:Drug Hypersensitivity / Q000276:immunology*; D020900:Echinacea / Q000276:immunology*; D006801:Humans; D006967:Hypersensitivity / Q000628:therapy*; D008517:Phytotherapy; D028321:Plant Preparations / Q000627:therapeutic use*; D012220:Rhinitis / Q000276:immunology* / Q000628:therapy
chemical_list: D000485:Allergens; D028321:Plant Preparations