GHB is a depressant of the central nervous system. Its effects have been described as similar to those of alcohol or ecstasy. People feel in a good mood. They also lower their inhibitions. If the dose is increased, the symptoms include nausea, drowsiness, breathing problems, amnesia, unconsciousness and death. The effect of GHB lasts between 1.5 and 3 hours, but may be longer. They can be longer if the drug is mixed with alcohol, or a large dosis was taken.