placebo vs sugar pill

placebo

noun
  • A dummy medicine containing no active ingredients; an inert treatment. 

  • The vespers sung in the office for the dead. 

sugar pill

noun
  • A placebo medication made with sugar. 

  • Used other than figuratively or idiomatically: see sugar, pill. 

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