Quantifying the Psychological Effects of Ketamine: From Euphoria to the k-Hole

52 ketamine users were opportunistically recruited to take part in a survey of the psychological effects of the drug, in Manchester, United Kingdom in 2008. Twenty-seven ketamine-naive respondents were also recruited for comparison in respect of other recreational drug use and level of schizotypy. Ketamine users attributed a wide range of appetitive, aversive, after-effect, and dissociative experiences to the drug. They also reported using a much wider range of other recreational drugs than ketamine non-users. Former users reported significantly fewer positive or dissociative experiences than current users.