anxiolytic vs barbiturate

anxiolytic

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

adj
  • That reduces anxiety; tranquilizing 

barbiturate

noun
  • Any of derivatives of barbituric acid that act as depressants of the central nervous system and are used as sedatives or hypnotics. 

  • Any salt or ester of barbituric acid. 

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