Acute and chronic effects of cannabinoids on effort-related decision-making and reward learning: an evaluation of the cannabis ‘amotivational’ hypotheses Will Lawn, Tom P. Freeman, Rebecca A. Pope, Alyssa Joye, Lisa Harvey, Chandni Hindocha, Claire Mokrysz, Abigail Moss, Matthew B. Wall, Michael A.P. Bloomfield, Ravi K. Das, Celia J.A. Morgan, David J. Nutt, H. Valerie Curran Psychopharmacology, 2016, 233, 3537–3552 Doi : 10.1007/s00213-016-4383-x Abstract Rationale : Anecdotally, both acute and chronic cannabis use have been associated with apathy, amotivation, and other reward processing deficits. To date, empirical support for these effects is limited, and no previous studies have assessed both acute effects of Δ-9-tetrahydrocannabinol (THC) and [...]
Lire la suiteLes troubles cognitifs et psychiatriques liés à la consommation de cannabis Alain DERVAUX, Marie-Odile KREBS , Xavier LAQUEILLE Bulletin de l'Académie Nationale de Médecine, 2014, 198, no 3, 559-577, séance du 25 mars 2014 RÉSUMÉ Plusieurs études ont montré que le Δ-9-THC, principal principe actif du cannabis entraînait des troubles de l’attention, de la mémoire et des fonctions exécutives. Ils sont liés à la dose, à la fréquence, à la durée d’exposition et à l’âge de la première consommation. Ils peuvent disparaître après sevrage, mais des anomalies durables s’observent chez les sujets ayant débuté leur consommation avant l’âge de 15 ans. La fréquence de [...]
Lire la suiteMedicinal cannabis for psychiatric disorders: a clinically-focused systematic review Jerome Sarris, Justin Sinclair, Diana Karamacoska, Maggie Davidson and Joseph Firth BMC Psychiatry, 2020, 20, 24, 1-14. Doi : 10.1186/s12888-019-2409-8 Abstract Background : Medicinal cannabis has received increased research attention over recent years due to loosening global regulatory changes. Medicinal cannabis has been reported to have potential efficacy in reducing pain, muscle spasticity, chemotherapy-induced nausea and vomiting, and intractable childhood epilepsy. Yet its potential application in the field of psychiatry is lesser known. Methods : The first clinically-focused systematic review on the emerging medical application of cannabis across all major psychiatric disorders was conducted. Current evidence regarding [...]
Lire la suiteA behavioural comparison of acute and chronic D9-tetrahydrocannabinol and cannabidiol in C57BL/6JArc mice Leonora E. Long, Rose Chesworth, Xu-Feng Huang, Iain S. McGregor, Jonathon C. Arnold and Tim Karl International Journal of Neuropsychopharmacology, 2010, 13, 861–876. doi : 10.1017/S1461145709990605 Abstract Cannabis contains over 70 unique compounds and its abuse is linked to an increased risk of developing schizophrenia. The behavioural profiles of the psychotropic cannabis constituent D9 tetrahydro-cannabinol (D9-THC) and the non-psychotomimetic constituent cannabidiol (CBD) were investigated with a battery of behavioural tests relevant to anxiety and positive, negative and cognitive symptoms of schizophrenia. Male adult C57BL/6JArc mice were given 21 daily intraperitoneal injections of vehicle, [...]
Lire la suiteThe Role of Cannabis in Treating Anxiety : An Update Michael Van Ameringen; Jasmine Zhang; Beth Patterson; Jasmine Turna Current Opinion in Psychiatry, 2019, 33, (1), 1-7. DOI : 10.1097/YCO.0000000000000566 https://www.medscape.com/viewarticle/922111?nlid=133169_425&src=WNL_mdplsfeat_191224_mscpedit_psyc&uac=292598PZ&spon=12&impID=2219742&faf=1 Abstract and Introduction Abstract Purpose of review: Cannabis use for medical purposes has become increasingly common, including as treatment for mental health disorders such as anxiety. Unfortunately, the evidence examining its use in mental health has been slow to evolve, but is emerging. Given the widespread use of cannabis, it is important for both clinicians and those who suffer with anxiety to understand the effects of cannabis on symptoms of anxiety. In this review, we present [...]
Lire la suiteMedical cannabis trial will target 20,000 UK patients Jamie Doward and Lily Gordon Brown The GUARDIAN, Published on Sun 3 Nov 2019 https://www.theguardian.com/society/2019/nov/03/medical-cannabis-uk-clinical-trial-patients-nhs Project backed by Royal College of Psychiatrists aims to be largest on drug’s use in Europe • Medical cannabis: Why are doctors still not prescribing it? Tilray medicinal cannabis growing facility in Canada. Photograph: Tilray Up to 20,000 patients in the UK are to be given medical cannabis over a two-year period in an initiative that aims to create the largest body of evidence on the drug in Europe. The move, to be unveiled on Thursday, is [...]
Lire la suiteEmerging from the dark side : new therapeutic applications of scheduled psychoactive substances Edward James, Thomas L Robertshaw & Andrew D Westwell Future Medical Chemistry, 2019 Doi : 10.4155/fmc-2018-0447 C - ISSN 1756-8919 “Public and mainstream scientific perceptions of these substances are shifting, and it is not difficult to envision a future in which MDMA and psilocybin play a role in contemporary medicine.” Keywords : harm reduction • healthcare • MDMA • positive psychology • psilocybin • psychoactive • psychotherapy The discovery and development of new medicines occupies years of painstaking and expensive scientific work, with multidisciplinary teams working together in the hope of developing a [...]
Lire la suiteAyahuasca : Psychological and Physiologic Effects, Pharmacology and Potential Uses in Addiction and Mental Illness Jonathan Hamill, Jaime Hallak, Serdar M. Dursun and Glen Baker Current Neuropharmacology, 2019, 17, 108-128. Doi : 10.2174/1570159X16666180125095902 Abstract Background : Ayahuasca, a traditional Amazonian decoction with psychoactive properties, is made from bark of the Banisteriopsis caapi vine (containing beta-carboline alkaloids) andleaves of the Psychotria viridis bush (supplying the hallucinogen N,N-dimethyltryptamine, DMT). Originally used by indigenous shamans for the purposes of spirit communication, magical experiences, healing, and religious rituals across several South American countries, ayahuasca has been incorporated into folk medicine and spiritual healing, and several Brazilian churches use [...]
Lire la suiteAntidepressive and anxiolytic effects of ayahuasca : a systematic literature review of animal and human studies Rafael G. dos Santos, Flavia L. Osorio, José Alexandre S. Crippa, Jaime E.C. Hallak Revista Brasileira de Psiquiatria, 2016, 38, 65–72 doi:10.1590/1516-4446-2015-1701 ABSTRACT Objective : To conduct a systematic literature review of animal and human studies reporting anxiolytic or antidepressive effects of ayahuasca or some of its isolated alkaloids (dimethyltryptamine, harmine, tetrahydroharmine, and harmaline). Methods : Papers published until 3 April 2015 were retrieved from the PubMed, LILACS and SciELO databases following a comprehensive search strategy and using a predetermined set of criteria for article selection. Results : Five hundred and [...]
Lire la suiteTherapeutic Effects of Prolonged Cannabidiol Treatment on Psychological Symptoms and Cognitive Function in Regular Cannabis Users : A Pragmatic Open-Label Clinical Trial Nadia Solowij, Samantha J. Broyd, Camilla Beale, Julie-Anne Prick, Lisa-marie Greenwood, Hendrika van Hell, Chao Suo, Peter Galettis, Nagesh Pai, Shanlin Fu, Rodney J. Croft, Jennifer H. Martin, and Murat Yücel Cannabis and Cannabinoid Research, 2018, 3, 1,21-35 Doi : 10.1089/can.2017.0043 Abstract Introduction : Chronic cannabis use has been associated with impaired cognition and elevated psychological symptoms, particularly psychotic-like experiences. While D9-tetrahydrocannabinol (THC) is thought to be primarily responsible for these deleterious effects, cannabidiol (CBD) is purported to have antipsychotic properties and to [...]
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