anxiolytic vs diazepam

anxiolytic

noun
  • A drug prescribed for the treatment of symptoms of anxiety. 

adj
  • That reduces anxiety; tranquilizing 

diazepam

noun
  • A tranquilizing muscle relaxant drug (trademark Valium) used chiefly to relieve anxiety. 

How often have the words anxiolytic and diazepam occurred in a corpus of books? (source: Google Ngram Viewer )