title: Effect of sildenafil (Viagra) on cerebral blood vessels.
authors.forename: Karen C
authors.initials: KC
authors.lastname: Johnston
mesh_terms: D002536:Cerebral Arteries / Q000187:drug effects* / Q000503:physiopathology; D002560:Cerebrovascular Circulation / Q000187:drug effects* / Q000502:physiology; D002561:Cerebrovascular Disorders / Q000139:chemically induced* / Q000503:physiopathology; D042783:Endothelial Cells / Q000187:drug effects / Q000502:physiology; D007172:Erectile Dysfunction / Q000188:drug therapy / Q000503:physiopathology; D006801:Humans; D008297:Male; D008881:Migraine Disorders / Q000139:chemically induced* / Q000503:physiopathology; D018579:Patient Selection; D010879:Piperazines / Q000009:adverse effects*; D011687:Purines; D018570:Risk Assessment; D000068677:Sildenafil Citrate; D013450:Sulfones; D014664:Vasodilation / Q000187:drug effects / Q000502:physiology; D014665:Vasodilator Agents / Q000009:adverse effects*
chemical_list: D010879:Piperazines; D011687:Purines; D013450:Sulfones; D014665:Vasodilator Agents; D000068677:Sildenafil Citrate