Martinak B, Bolis RA, Black JR, Fargason RE, Birur B. Dextromethorphan in Cough Syrup: The Poor Man's Psychosis. Psychopharmacology Bulletin. 2017; 47(4):1-5 ...
Guaifenesin is the active ingredient ... Like DayQuil, NyQuil contains the analgesic acetaminophen and the cough suppressant ...