title: Urticaria of unknown origin.
mesh_terms: D004837:Epinephrine / Q000627:therapeutic use; D006801:Humans; D006919:Hydroxyzine / Q000627:therapeutic use; D008297:Male; D008875:Middle Aged; D011241:Prednisone / Q000627:therapeutic use; D014581:Urticaria / Q000188:drug therapy / Q000209:etiology*
chemical_list: D006919:Hydroxyzine; D011241:Prednisone; D004837:Epinephrine