anxiolytic vs ataraxic

anxiolytic

adj
  • That reduces anxiety; tranquilizing 

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

ataraxic

adj
  • ataractic; tranquilizing 

  • Of or pertaining to ataraxia or ataraxy 

noun
  • An ataractic or tranquilizing agent. 

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