Classification: Psychoactive sedative
Commercial Names: Valium, Rohypnol, Ativan, Xanax, Halcion, Paxipam, Restorial, and hundreds of others
Common Names/Nicknames: Benzos, BZDs, candy, downers, sleeping pills, tranks, bullets, roofies
Active Compound: Diazepam (Valium), flunitrazepam (Rohypnol), and hundreds of others
Found in: Prescription benzodiazepenes
Mode of Consumption: Ingestion, injection, insufflation
DEA Scheduling/Legal Status (in US): Schedule IV; legal with prescription, often with restrictions or regulations
Relaxation, reduced anxiety, drowsiness
Loss of coordination, memory impairment, decreased learning potential, anxiety, nightmares, respiratory depression, hostility, rage.
Inhalation (smoking): emphysema, lung damage (talcosis); Injection: lung damage (talcosis)
Dangerous Drug Combinations:
Potentially fatal combination with alcohol, benzodiazepines, barbiturates, inhalants, and other respiratory depressants.
Special Considerations:
Associated with sexual assaults and/or rape (particularly flunitrazepam [Rohypnol] due to its high potency).


And remember, if somebody needs help, play it safe and call for medical assistance.

“Students may bring an intoxicated or drug-impaired friend to University Health Services or to a hospital, or seek assistance from College residential life staff or HUPD, and by doing this, neither they nor the friend will face disciplinary action from the College for having used or provided alcohol or drugs.”

                                                                                    The Amnesty Policy
Harvard College Student Handbook

Buzzed: The Straight Facts About the Most Used and Abused Drugs from Alcohol to Ecstasy (Third Edition), by Cynthia Kuhn, Scott Swartzwelder, andWilkie Wilson. Published 2008 by W. W. Norton & Company.
National Institute on Drug Abuse (NIDA), part of the National Institute of Health (NIH) of the U.S. Department of Health and Human Services. 
U.S. Drug Enforcement Agency (DEA), part of the U.S.Department of Justice.
Erowid Organization