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Artigo Psilocybin occasioned mystical-type experiences: immediate and persisting dose-related effects

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Psilocybin occasioned mystical-type experiences: immediate and persisting dose-related effects

Roland R. Griffiths & Matthew W. Johnson & William A. Richards & Brian D. Richards & Una McCann & Robert Jesse

Received: 5 February 2011 / Accepted: 13 May 2011 / Published online: 15 June 2011 # Springer-Verlag 2011

Abstract
Rationale This dose-effect study extends previous observa- tions showing that psilocybin can occasion mystical-type experiences having persisting positive effects on attitudes, mood, and behavior.
Objectives This double-blind study evaluated psilocybin (0, 5, 10, 20, 30 mg/70 kg, p.o.) administered under supportive conditions.
Methods Participants were 18 adults (17 hallucinogen- naïve). Five 8-h sessions were conducted individually for each participant at 1-month intervals. Participants were randomized to receive the four active doses in either ascending or descending order (nine participants each). Placebo was scheduled quasi-randomly. During sessions, volunteers used eyeshades and were instructed to direct their attention inward. Volunteers completed questionnaires assessing effects immediately after and 1 month after each session, and at 14 months follow-up.
Results Psilocybin produced acute perceptual and subjec- tive effects including, at 20 and/or 30 mg/70 kg, extreme anxiety/fear (39% of volunteers) and/or mystical-type experience (72% of volunteers). One month after sessions at the two highest doses, volunteers rated the psilocybin experience as having substantial personal and spiritual significance, and attributed to the experience sustained positive changes in attitudes, mood, and behavior, with the ascending dose sequence showing greater positive effects. At 14 months, ratings were undiminished and were consistent with changes rated by community observers. Both the acute and persisting effects of psilocybin were generally a monotonically increasing function of dose, with the lowest dose showing significant effects.
Conclusions Under supportive conditions, 20 and 30 mg/ 70 kg psilocybin occasioned mystical-type experiences having persisting positive effects on attitudes, mood, and behavior. Implications for therapeutic trials are discussed.
Keywords Psilocybin . Dose effects . Hallucinogen . Entheogen . Psychedelic . Mystical experience . Fear . Spiritual . Religion . Positive psychology . Humans

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