PMID- 34048997 OWN - NLM STAT- MEDLINE DCOM- 20210705 LR - 20210705 IS - 1879-1379 (Electronic) IS - 0022-3956 (Linking) VI - 139 DP - 2021 Jul TI - Registered clinical studies investigating psychedelic drugs for psychiatric disorders. PG - 71-81 LID - S0022-3956(21)00288-0 [pii] LID - 10.1016/j.jpsychires.2021.05.019 [doi] AB - Psychedelics are a hallucinogenic class of psychoactive drugs with the primary effect of activating non-ordinary states of consciousness. Due to the positive preliminary findings of these drugs in the treatment of psychiatric disorders, the number of registered clinical studies has risen significantly. In this paper, clinical studies registered on clinicaltrials.gov that evaluate the treatment of any psychiatric disorder with psychedelics (excluding ketamine) are summarized and analyzed. 70 registered studies were identified from a clinicaltrials.gov search on December 3, 2020. The majority of studies aim to investigate methylenedioxymethamphetamine (MDMA) (45.7%) and psilocybin (41.4%). Studies evaluating ayahuasca, lysergic acid diethylamide (LSD), ibogaine hydrochloride, salvia divinorum, 5-MeO-DMT and DMT fumarate were less common at 1.4%, 4.2%, 2.8%, 1.4%, 1.4% and 1.4% of total registered studies, respectively. Most of the studies on MDMA, psilocybin, ayahuasca and salvia divinorum investigated their therapeutic effect on post-traumatic stress disorder (PTSD) and major depressive disorder (MDD). LSD was investigated for MDD, anxiety, and severe somatic disorders and ibogaine hydrochloride was investigated for substance and alcohol use disorders. 5-MeO-DMT and DMT fumarate were both investigated for MDD. Only 21/70 registered studies had published results with the majority not yet completed. In view of the large number of ongoing studies investigating psychedelics, it is imperative that these studies are considered by researchers and stakeholders in deciding the most relevant research priorities for future proposed studies. CI - Copyright (c) 2021 Elsevier Ltd. All rights reserved. FAU - Siegel, Ashley N AU - Siegel AN AD - Mood Disorders Psychopharmacology Unit, University Health Network, Toronto, ON, Canada. FAU - Meshkat, Shakila AU - Meshkat S AD - Mood Disorders Psychopharmacology Unit, University Health Network, Toronto, ON, Canada. FAU - Benitah, Katie AU - Benitah K AD - Mood Disorders Psychopharmacology Unit, University Health Network, Toronto, ON, Canada. FAU - Lipsitz, Orly AU - Lipsitz O AD - Mood Disorders Psychopharmacology Unit, University Health Network, Toronto, ON, Canada. FAU - Gill, Hartej AU - Gill H AD - Mood Disorders Psychopharmacology Unit, University Health Network, Toronto, ON, Canada; Institute of Medical Science, University of Toronto, Toronto, ON, Canada. FAU - Lui, Leanna M W AU - Lui LMW AD - Mood Disorders Psychopharmacology Unit, University Health Network, Toronto, ON, Canada. FAU - Teopiz, Kayla M AU - Teopiz KM AD - Mood Disorders Psychopharmacology Unit, University Health Network, Toronto, ON, Canada. FAU - McIntyre, Roger S AU - McIntyre RS AD - Mood Disorders Psychopharmacology Unit, University Health Network, Toronto, ON, Canada; Department of Psychiatry, University of Toronto, Toronto, ON, Canada; Department of Pharmacology and Toxicology, University of Toronto, Toronto, ON, Canada; Brain and Cognition Discovery Foundation, Toronto, ON, Canada. FAU - Rosenblat, Joshua D AU - Rosenblat JD AD - Mood Disorders Psychopharmacology Unit, University Health Network, Toronto, ON, Canada; Department of Psychiatry, University of Toronto, Toronto, ON, Canada. Electronic address: joshua.rosenblat@uhn.ca. LA - eng PT - Journal Article PT - Review DEP - 20210518 PL - England TA - J Psychiatr Res JT - Journal of psychiatric research JID - 0376331 RN - 0 (Hallucinogens) RN - 0 (Pharmaceutical Preparations) RN - 2RV7212BP0 (Psilocybin) SB - IM MH - *Alcoholism MH - *Depressive Disorder, Major/drug therapy MH - *Hallucinogens/therapeutic use MH - Humans MH - *Pharmaceutical Preparations MH - Psilocybin OTO - NOTNLM OT - Ayahuasca OT - DMT OT - Depression OT - Ibogaine OT - LSD OT - MDMA OT - Post-traumatic stress disorder OT - Psilocybin OT - Psychedelics OT - Psychiatric disorders EDAT- 2021/05/29 06:00 MHDA- 2021/07/06 06:00 CRDT- 2021/05/28 20:16 PHST- 2020/12/24 00:00 [received] PHST- 2021/04/22 00:00 [revised] PHST- 2021/05/01 00:00 [accepted] PHST- 2021/05/29 06:00 [pubmed] PHST- 2021/07/06 06:00 [medline] PHST- 2021/05/28 20:16 [entrez] AID - S0022-3956(21)00288-0 [pii] AID - 10.1016/j.jpsychires.2021.05.019 [doi] PST - ppublish SO - J Psychiatr Res. 2021 Jul;139:71-81. doi: 10.1016/j.jpsychires.2021.05.019. Epub 2021 May 18.