• GHB has sedative properties and can produce feelings of euphoria

• At low doses GHB has a relaxing effect on the user. At higher doses GHB can lead to drowsiness, sickness, fits or unconsciousness.

• There is only a very small difference between the dose which produces pleasant sensations and the dose which causes unconsciousness.

• The effects have been known to last for a day.

• GHB has been used in medicine by anaesthetists.