Rohypnol is the common name for a drug called flunitrazepam. A slang term for it is roofies. The drug is sold legally, and it has many medical uses. It is a strong hypnotic (a drug that causes sleep); a sedative (causing relaxation and sleepiness); an anticonvulsant (fighting seizures); an anxiolytic (relieving anxiety); amnestic (causing forgetfulness); and skeletal muscle relaxant. Most often, it is used as a treatment for sleep disorders like insomnia. It is thought to be one of the most effective hypnotic medications.