flunitrazepam

noun

flu·​ni·​traz·​e·​pam ˌflü-nə-ˈtraz-ə-ˌpam  -ˌnī- 

: a powerful benzodiazepine drug C₁₆H₁₂FN₃O₃ with sedative and sleep-inducing properties that is not licensed for use in the U.S. but is used medically in other countries and that is a frequent illicit drug of abuse

Note: Flunitrazepam was formerly marketed in the U.S. under the trademark Rohypnol. In illicit use, a tablet of flunitrazepam is often referred to as a roofie.