title: Hypotensive attacks due to systemic mastocytosis.
mesh_terms: D006801:Humans; D007022:Hypotension / Q000209:etiology*; D007665:Ketotifen / Q000627:therapeutic use; D008297:Male; D008415:Mastocytosis / Q000150:complications* / Q000175:diagnosis / Q000188:drug therapy; D008875:Middle Aged
chemical_list: D007665:Ketotifen