psychoactive vs psychotropic

psychoactive

adj

  • Affecting the mind or mental processes. 

noun

  • Any drug that affects the mind or mental processes. 

psychotropic

adj

  • Affecting the mind or mental processes. 

noun

  • A psychotropic drug or agent. 

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