title: Low bioavailability as a cause of apparent failure of dihydroergotamine in orthostatic hypotension.
mesh_terms: D000284:Administration, Oral; D000368:Aged; D001682:Biological Availability; D004087:Dihydroergotamine / Q000008:administration & dosage / Q000378:metabolism* / Q000627:therapeutic use; D005260:Female; D006801:Humans; D007024:Hypotension, Orthostatic / Q000188:drug therapy*; D007275:Injections, Intravenous; D008297:Male; D008875:Middle Aged
chemical_list: D004087:Dihydroergotamine