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The authors review the history of and recent research on the psychotherapeutic efficacy of psychedelic drugs. Psychedelic drugs appear to provide access to unconscious material and, when used in a therapeutic context, may cause deep and longstanding psychological change. The psychological effects of psychedelic drugs are reviewed from the perspective of Jungian theory. A series of clinical vignettes illustrates the archetypal aspects of hallucinogenic experiences.
Mahr et al. (Mon,) studied this question.