Effects of Rohypnol
Rohypnol is a potent sedative. The physical effects of the drug may be noticeable within twenty to thirty minutes after ingestion. The effects may last for many hours.
Rohypnol may cause drowsiness, confusion, impaired motor skills, dizziness, disorientation, disinhibition, impaired judgment, and reduced levels of consciousness. You may look and act like someone who is drunk. Your speech may be slurred, and you may have difficulty standing or walking. Or, you may be rendered completely unconscious.
It is very dangerous to mix Rohypnol with alcohol or other drugs. The combination can produce extremely low blood pressure, respiratory depression, difficulty breathing, coma, or even death.
One of the most disturbing effects of Rohypnol is that it can cause complete or partial "anterograde" amnesia (absence of memory for the events that occur after it is ingested). This means that you may not be able to remember what was done to you while you were under the influence of the drug, which may have been for a significant period of time. This "amnestic" effect is especially likely when Rohypnol is ingested with alcohol.