National Drug & Alcohol Interventionists

The Effects of GHB & Rohypnol

Short-term effects of GHB - The effects of GHB and Rohypnol follow a similar pattern. The effects of Rohypnol begin within a half-hour, but don’t peak for almost two hours. GHB takes effect within 10-20 minutes, but don’t peak for almost an hour. The feeling the user gets from both drugs are the same – first they feel intoxication similar to alcohol (the user feels relaxed, sociable, affectionate and playful, and uninhibited), followed by a feeling of drowsiness. Higher doses can lead to a sleep from which the user cannot be woken. The effects can last from 4-24 hours.

Long-Term Effects of GHB – Right now, the long-term effects of GHB use are not known. However, since it is made from industrial chemicals, there is a risk of severe burns to the mouth, throat, and stomach from GHB that has been improperly produced.

Rohypnol is both physically and psychologically addictive. Withdrawal symptoms peak 3-5 days after last use, and include extreme anxiety, muscle pain, headache, hallucinations, and seizures. Some withdrawal symptoms, including cardiovascular collapse, can be fatal.

Information provided by