EMILY: [sees Lorelai taking a pill] What are you taking?
LORELAI: Roofies.
“Roofies” is slang for Rohypnol, a drug used to treat severe insomnia and assist with anaesthesia. It is widely known for its use as a date rape drug. It is an illegal drug in the US, banned from medical use and not allowed for import.
The Annotated Gilmore Girls 