diazepam vs neuroleptic

diazepam

noun

  • A tranquilizing muscle relaxant drug (trademark Valium) used chiefly to relieve anxiety. 

neuroleptic

noun

  • An antipsychotic drug. 

adj

  • Having antipsychotic properties. 

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