laxative vs mitigatory

laxative

adj
  • Having the effect of moving the bowels, or aiding digestion and preventing constipation. 

noun
  • Any substance, such as a food or in the form of a medicine which has a laxative effect. 

mitigatory

adj
  • reducing, lessening the effects of something, generally something painful or uncomfortable 

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