• At low doses ketamine produces a peculiar altered state of consciousness which makes people feel they are not part of reality. Users hallucinate, lose co-ordination and become unsteady on their feet. • At higher doses the anaesthetic effect takes over and numbs the body. When this happens, users can be physically unable to move. Serious injury can occur without the user realising. • Ketamine can make the user feel different at different times. The effects can be unpredictable. If the user is feeling anxious, nervous or uncomfortable, s/he is more likely to have a bad experience.