title: Nitrolglycerin as a provocative agent in cluster headache.
mesh_terms: D000328:Adult; D001794:Blood Pressure / Q000187:drug effects; D006261:Headache / Q000139:chemically induced* / Q000188:drug therapy; D006801:Humans; D008297:Male; D008875:Middle Aged; D005996:Nitroglycerin; D010146:Pain; D010276:Parasympatholytics / Q000627:therapeutic use; D011674:Pulse / Q000187:drug effects; D013876:Thiophenes / Q000627:therapeutic use; D013997:Time Factors
chemical_list: D010276:Parasympatholytics; D013876:Thiophenes; D005996:Nitroglycerin