title: Letter: Cerebral vasodilators.
mesh_terms: D002560:Cerebrovascular Circulation / Q000187:drug effects; D004088:Dihydroergotoxine / Q000494:pharmacology / Q000627:therapeutic use; D006801:Humans; D019965:Neurocognitive Disorders / Q000188:drug therapy*; D010919:Placebos; D014665:Vasodilator Agents / Q000494:pharmacology / Q000627:therapeutic use*
chemical_list: D010919:Placebos; D014665:Vasodilator Agents; D004088:Dihydroergotoxine