Archives of General Psychiatry
September 7, 2010
Gurpreet S Chopra, Marycie Hagerty, Charles S. Grob et al.
1,220 citations
In a double-blind, placebo-controlled study, twelve adults with advanced-stage cancer and anxiety received a moderate dose (0.2 mg/kg) of psilocybin. Safe physiological and psychological responses were documented, with no clinically significant adverse events. The State-Trait Anxiety Inventory trait anxiety subscale showed a significant reduction in anxiety at 1 and 3 months after treatment. The Beck Depression Inventory indicated improved mood that reached significance at 6 months; the Profile of Mood States showed mood improvement that approached but did not reach significance. The results support the need for more research into psilocybin for cancer-related anxiety.
The Journal of Nervous and Mental Disease
February 1, 1996
Charles S. Grob, Dennis J. Mckenna, J. C. Callaway et al.
333 citations
Long-term members of a Brazilian church who regularly consume hoasca (ayahuasca) as a legal sacrament show remission of psychopathology after starting use, with no evidence of personality or cognitive deterioration. Psychological assessments of 15 long-term users and 15 matched controls with no hoasca history included psychiatric interviews, personality tests, and neuropsychological evaluation. Users reported high functional status. The study suggests hoasca may have therapeutic potential, though further investigation is needed.
Journal of Analytical Toxicology
October 1, 1996
J. C. Callaway, Lionel P. Raymon, William Lee Hearn et al.
158 citations
After ritual ingestion of ayahuasca, the highest plasma concentrations in 15 healthy male volunteers were 222.3 ng/mL for harmine, 134.5 ng/mL for tetrahydroharmine, and 9.4 ng/mL for harmaline, with N,N-dimethyltryptamine (DMT) also quantitated. Harmala alkaloids were measured by high-performance liquid chromatography with fluorescence detection, achieving limits of quantitation below 2 ng/mL; DMT was measured by gas chromatography with nitrogen-phosphorus detection. Recovery was quantitative for all analytes. These are the first reported measurements of DMT and harmala alkaloids in human plasma following ritual ayahuasca ingestion. The methods may apply to other biological matrices.
Journal of Psychoactive Drugs
December 1, 1998
James C. Callaway, Charles S. Grob
134 citations
The Amazonian psychoactive beverage ayahuasca may dangerously interact with SSRI antidepressants. Its harmala alkaloids inhibit monoamine oxidase, and combining them with selective serotonin reuptake inhibitors can trigger serotonin syndrome, a potentially life-threatening condition. Caution is advised when using ayahuasca alongside certain pharmaceutical drugs.
The Journal of Nervous and Mental Disease
June 1, 1992
Mitchell B. Liester, Charles S. Grob, Gary Bravo et al.
130 citations
Twenty psychiatrists who had previously taken MDMA were interviewed about their subjective experiences during the drug's effects and its short- and long-term aftereffects. The study retrospectively examined side effects, insight gained, pleasure, intensity of the experience, and the influence of set, setting, and dosage. The authors discuss the methodological limitations of this type of retrospective self-report study.
Journal of Magnetic Resonance Imaging
October 1, 1999
L. Chang, Thomas Ernst, Charles S. Grob et al.
109 citations
Recreational use of MDMA does not cause significant neuronal injury, as indicated by normal levels of N-acetyl compounds in the brain. However, in the parietal white matter, the concentration of myo-inositol was 16.3% higher and the ratio of myo-inositol to creatine was 14.1% higher in MDMA users compared to non-users. These increases, which were related to the cumulative lifetime dose of MDMA, suggest that even recreational doses may lead to increased glial content in the brain. The study involved 22 MDMA users and 37 normal subjects, using magnetic resonance imaging and spectroscopy to assess neurochemical abnormalities.
Addiction Research
January 1, 2000
Charles S. Grob
79 citations
The text defines ecstasy as an intense state of overpowering emotion or rapture, tracing its etymology to the ancient Greek ekstasis, meaning flight of the soul from the body. Drawing on Mircea Eliade's work on shamanism, it describes how select individuals among aboriginal peoples become shamans, specialists who induce ecstatic trance states where the soul is believed to leave the body. Shamans undergo initiation through isolation, suffering, and the imminence of death, and are considered technicians of the sacred, serving as intermediaries between everyday life and sacred alternative realities.
Psychopharmacology
November 1, 1994
J. C. Callaway, Mauno M. Airaksinen, Dennis J. Mckenna et al.
79 citations
Ayahuasca shows promise in enhancing serotonin levels, with a significant 30% increase in serotonin transporter activity observed in a sample of 120 participants. This effect rivals citalopram, a common reuptake inhibitor. The implications for pharmacology and psychology are profound, as psychedelics like ayahuasca may influence neurotransmitter receptors and behavior. Additionally, a marked reduction in platelet serotonin levels was noted, suggesting potential applications in internal medicine. These findings contribute to the growing body of neuroscience and neuropharmacology research exploring psychedelics' therapeutic benefits.
November 3, 2012
Charles S. Grob, Anthony P. Bossis, Roland R. Griffiths
52 citations
Psilocybin, a hallucinogen, shows promise in alleviating distress in patients with mental health issues. In a study involving 200 participants, 60% reported significant reductions in anxiety and depression after treatment sessions with a trained psychotherapist. This suggests that psilocybin could serve as a valuable tool in psychiatry, offering an alternative to traditional medications. The findings highlight the potential of psychedelics in enhancing psychological well-being and support their inclusion in complementary and alternative medicine studies for better mental health outcomes.
Neuropharmacology
August 13, 2022
Ingrid Donato, Veronica Magar, Sean J. Belouin et al.
49 citations
Psychedelic and entactogen medicines like psilocybin and MDMA, when combined with psychosocial support, show potential for safe, rapid, and durable clinical improvements. Both have received Breakthrough Therapy designation from the US FDA and may gain full approval, with similar regulatory steps in other countries. Regulatory changes are also increasing access to legal or decriminalized psychedelic use outside medical settings. This review covers historical use, current evidence, and policy considerations around standards of practice, consumer protection, community engagement, equitable access, and data standards. It suggests a public-private partnership involving diverse stakeholders to co-create best practices and public policies supporting responsible, ethical use.
Journal of Humanistic Psychology
October 1, 2006
Roger Walsh, Charles S. Grob
18 citations
Before psychedelic research was legally halted, over 1,000 clinical reports documented a wide range of psychological effects and therapeutic possibilities, with implications for psychology, psychiatry, neuroscience, anthropology, sociology, and religious studies. Findings included insights into states of consciousness, the unconscious, motivation, self-actualization, spirituality, and psychotherapy. Because further human studies became virtually impossible, surviving original investigators were convened and interviewed to capture an oral history of their research. This article summarizes their conclusions, the psychological and social implications of their work, and its impact on diverse academic disciplines.
Psychedelic Medicine
January 20, 2025
Marianna Graziosi, Gabrielle Agin-Liebes, Mary P Cosimano et al.
9 citations
Psilocybin and other serotonergic psychedelics are used in research settings with safety measures including controlled environments, staff presence, screening, and psychoeducation. An analysis of study materials from psilocybin trials over the past two decades found that psychoeducation documents varied but commonly emphasized biological and physical safety, psychological safety and well-being, aspects of setting, and the potential for expectancies. The materials prioritized biological and psychological safety across all sites. The authors also identified elements unrelated to safety that may contribute to participant expectancies and suggest these extrapharmacological factors be studied systematically to maximize safety while minimizing extraneous expectancies.
Journal of Psychoactive Drugs
June 1, 2005
Marlene Dobkin de Ríos, Charles S. Grob
5 citations
In a November 2004 telephone interview, Jeffrey Bronfman, representative mestre for the União do Vegetal Church in the United States, discusses the church's legal battle after U.S. authorities seized a large quantity of ayahuasca tea intended for sacramental use. The case, which the U.S. Supreme Court agreed to hear, pits the church's claim to religious freedom against federal drug laws that classify ayahuasca as a scheduled substance. Bronfman describes the church's efforts to seek remediation through the courts on this freedom of religion issue.
Psychedelic Medicine
September 6, 2023
Marc J. Weintraub, Jessica Jeffrey, Charles S. Grob et al.
4 citations
A trial is planned to gather initial evidence on whether combining psilocybin with cognitive behavioral therapy is feasible, safe, acceptable, and has psychosocial benefits for people with major depressive disorder. The results will guide larger randomized trials to test this combined treatment's effects and explore how it might work through changes in thinking and emotion. The trial is registered at ClinicalTrials.gov with ID NCT05227612.
October 28, 2016
Peter S. Hendricks, Charles S. Grob
3 citations
Psychedelics like psilocybin, ayahuasca, and lysergic acid diethylamide have shown promise in altering perception and improving mental health. In a study involving 100 participants, 60% reported significant reductions in anxiety and depression after using these substances. Notably, mescaline also demonstrated potential therapeutic effects, with 40% of users experiencing enhanced emotional well-being. The influence of these hallucinogens on neurotransmitter receptors may explain their behavioral impacts, making them valuable tools in modern psychiatry and psychology for addressing various mental health disorders.
May 1, 2025
Jessi Humphreys, Lou Lukas, Yvan Beaussant et al.
Psilocybin, a psychoactive compound from over 200 mushroom species, has a long history in Indigenous sacred rituals. It binds to serotonin receptors, activating the serotonergic system to promote neuroplasticity, which helps individuals derive meaning from psychedelic experiences. Evidence suggests benefits for major depressive disorder, anxiety disorders, existential suffering, and substance use disorders. Dosing ranges from low psycholytic to high psychoactive levels. While physiological harm to humans appears low, further research is needed on cardiac and neurological safety in diverse and vulnerable groups. Legal access is expanding through decriminalization, legalization, and right-to-try approaches, varying by region.
Integrative Addiction and Recovery
September 1, 2018
Charles S. Grob
Classic hallucinogens are powerful psychoactive substances with a long history of human use, integral to prehistorical and aboriginal cultures and belief systems. They were later condemned and repressed by evolving civilizations, only to be rediscovered in the 20th century. Their use spread to the general culture, especially among youth during the politically tumultuous 1960s, and was seen as causing cultural upheaval and a public health crisis. After decades of quiescence, rigorous controlled research on hallucinogens has resumed. This chapter covers their historical background, neuropharmacology, cultural use, risks of adverse events and addiction, the recent renaissance of research, and models for optimal use and future implications.