Flunitrazepam (Rohypnol) roofies started becoming widely used Flunitrazepam (Rohypnol) http://www.cesar.umd.edu/cesar/drugs/rohypnol.asp Center for Substance Abuse Research http://www.cesar.umd.edu/cesar/drugs/rohypnol.asp http://www.cesar.umd.edu/cesar/drugs/rohypnol.asp Flunitrazepam (Rohypnol) Rohypnol interferes with the production of GABA has been used in sexual assaults Flunitrazepam (Rohypnol) Center for Substance Abuse Research