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Studies of psychedelic-assisted therapy with LSD, psilocybin, MDMA, and related substances show clinical promise but inadequately assess side effects. Measuring side effects is challenging because they are not always easily differentiated from treatment effects or disease symptoms and show high heterogeneity, variable duration and impact, and sensitivity to context. A systematic questionnaire describing important characteristics of side effects of psychedelics and MDMA would greatly improve on previous methods. We aimed to create a standardized tool for recording clinically relevant side effects of psychedelics and MDMA, including their severity, duration, impact, and treatment-relatedness. We constructed the Swiss Psychedelic Side Effects Inventory (SPSI) based on insights from previous research. It was pilot tested in 145 participants from three studies. Structured feedback from an expert panel was used to improve validity and feasibility. The final SPSI contains 32 side effects and standardized follow-up questions about their severity, impact, treatment-relatedness, and duration. It is compatible with any study design and can be administered as an interview or self-report at any timepoint after treatment with psychedelics or MDMA. The SPSI omits relatively unimportant side effects for brevity's sake, though space for additional symptoms is given. Future studies are needed to confirm its validity in different contexts. The SPSI is available in English and German for collecting systematic data on side effects from psychedelics and MDMA. This information is vital for improving clinical decisions, informed consent, and patient safety. • Psychedelics and MDMA can cause a unique profile of side effects which are not well-captured by the methods used in previous studies. • Psychedelic side effects vary in their severity, duration, and subjective impact. • Using previous studies, pilot data, and expert feedback, we developed the Swiss Psychedelic Side Effects Inventory (SPSI). • The SPSI contains 32 side effects and assesses their severity, impact, duration, and treatment-relatedness. • The SPSI can be used at any timepoint after psychedelic administration in any study of psychedelics or MDMA. [ABSTRACT FROM AUTHOR]

Despite psychedelic microdosing being a growing practice, the research on the topic is still in its infancy. While several studies have described the characteristics, motivations and practices of microdosers, the differences between individuals that only microdose and those that use both micro and macrodoses of psychedelics remain unexplored. In an online survey, we collected data of 6193 psychedelic consumers of which 2488 were microdosers of up to 11 different classical and atypical psychedelics. In comparison to respondents that use both microdoses and macrodoses, exclusive microdosers were older in age (46.4 vs. 42.0 years), had a larger proportion of females (68.4% vs. 44.7%), were non-Caucasian (25.4% vs. 14.7%), urban residents (43.9% vs. 38.5%), and had a lower average lifetime use of non-psychedelic substances (3.8 vs. 4.7 substances). Most consumers (52.5%) microdosed psychedelics multiple times a month, commonly using psilocybin (74.5%), LSD (34.4%), and ketamine (15.8%), with most users (64.6%) not testing their substances. The most common reason for microdosing was improving general wellbeing (73.0%), and psychedelics were used for treating several physical and mental health conditions. Additional analyses examined spending habits of consumers. This study adds to the growing literature on the naturalistic use of psychedelic microdosers. [ABSTRACT FROM AUTHOR]

Introduction Methods Results Discussion and Conclusions This study explores the attitudes of psychologists towards psychedelics and psychedelic‐assisted therapy (PAT) following the world‐first regulatory changes in 2023 in Australia which permitted psilocybin and 3,4‐methylenedioxy‐methamphetamine (MDMA) to be used in clinical services.A purposive sample of 20 Australian psychologists was recruited using snowball sampling. Semi‐structured interviews were conducted which explored participants' attitudes, knowledge and concerns about PAT. Data were coded and analysed to identify and develop theme categories.Most psychologists exhibited positive attitudes towards psychedelics and their therapeutic potential, viewing them as promising for addressing chronic mental health conditions like depression. However, there was a notable concern regarding the limited evidence on efficacy and potential adverse experiences, as well as the complexity of the individualised treatment protocol. Despite enthusiasm, many psychologists had limited detailed knowledge about the interventions themselves. The need for comprehensive education and training programs, including exposure to psychedelic experiences and credible higher education institutions, was emphasised to ensure competence in administering PAT.Psychologists displayed notably positive attitudes towards PAT, likely reflecting both shifting perceptions of psychedelics and self‐selection bias within the sample. Despite this optimism, concerns were raised about psychiatric risks and the necessity for comprehensive and reputable training and supervision. The cohort showed openness to both novel treatments and innovative training methods, underscoring the importance of enhancing educational frameworks to ensure effective implementation of PAT. [ABSTRACT FROM AUTHOR]

Psilocybin is gaining popularity as research shows potential benefits to those with anxiety, depression, and other mental health conditions. Individuals with risk factors for psychosis are typically excluded from such studies, limiting the empiric research of the risks and benefits in vulnerable populations. In the real-world setting, many individuals who seek treatment with psilocybin will have comorbid psychiatric conditions and other factors that predispose them to psychosis. We report a case of a patient with multiple predisposing risk factors, including a history of depression, personality disorder traits, and cannabis use, who experienced a psychotic episode with catatonic features and suicidality after several months of heavy psilocybin use. A review of similar previously published case reports demonstrates a pattern of psilocybin-induced psychosis occurring primarily in individuals with predisposing factors who have consumed either high or repeated doses of the drug. This case report furthers this pattern, which serves as both a warning that psilocybin use is not without risks and reassurance for researchers using much lower doses to treat mental illness. [ABSTRACT FROM AUTHOR]

Substance use disorder (SUD) is common in psychiatric patients and has a negative impact on health and well-being. However, SUD often goes untreated, and there is a need for psychiatrists, of all specialties, to address this pervasive clinical problem. In this review, the authors' goal is to provide a resource that describes treatments for SUD, using neuroscience as a framework. They discuss the effect of pharmacotherapy on craving, intoxication, and withdrawal and its ability to interrupt the cycle of substance use in SUD. The neuroscience of stress is reviewed, including medications targeting neurotransmitter systems activated by alarm and fear. Neuroplasticity and promising treatments that use this mechanism, including ketamine, psilocybin, and transcranial magnetic stimulation (TMS), are discussed. The authors conclude by listing resources and practice guidelines for physicians interested in learning more about treatments for SUD. [ABSTRACT FROM AUTHOR]

• Psilocybin has shown promise for the treatment of psychiatric disorders. • Psilocybin was administered following extinction of cocaine self-administration. • Psilocybin had no effect on reinstatement in mice or rats. There are currently no pharmacological treatments for cocaine use disorder. Recently there has been a great deal of interest in the potential of psychedelic drugs such as psilocybin to treat psychiatric disorders. Human studies have indicated that a single administration of psilocybin can have long-lasting effects. Few preclinical studies have examined a role for psilocybin in addiction models. The goal of the current study was to determine whether psilocybin would enhance extinction following cocaine self-administration in male and female mice and rats and thus result in an attenuation of cue-induced drug-seeking. In experiments in mice, 16 female and 19 male mice underwent 8d of cocaine self-administration (0.5 mg/kg/infusion) and extinction training. Immediately following extinction trials, mice were injected with vehicle or 1.0 mg/kg psilocybin. Following the conclusion of extinction training, mice were tested for cue-induced reinstatement. In experiments in rats, 24 female and 23 male rats underwent 15d of cocaine self-administration (0.8 mg/kg/infusion) and extinction training. Immediately following extinction trials, rats were injected with vehicle, 1.0 mg/kg psilocybin, or 2.5 mg/kg psilocybin. Following the conclusion of extinction training, rats were tested for cue-induced reinstatement. Psilocybin administered following extinction trials had no effect, as both female and male mice and rats demonstrated significant cue-induced reinstatement. These data suggest that psilocybin is ineffective at altering cocaine-seeking behavior in the paradigm and doses used in the current study. It remains to be seen whether treatment with psilocybin under different conditions may be useful in the long-standing goal of finding pharmacotherapies to treat CUD. [ABSTRACT FROM AUTHOR]

Psychedelic drugs have seen a resurgence in interest as a next generation of psychiatric medicines with potential as rapid‐acting antidepressants (RAADs). Despite promising early clinical trials, the mechanisms which underlie the effects of psychedelics are poorly understood. For example, key questions such as whether antidepressant and psychedelic effects involve related or independent mechanisms are unresolved. Preclinical studies in relevant animal models are key to understanding the pharmacology of psychedelics and translating these findings to explain efficacy and safety in patients. Understanding the mechanisms of action associated with the behavioural effects of psychedelic drugs can also support the identification of novel drug targets and more effective treatments. Here we review the behavioural approaches currently used to quantify the psychedelic and antidepressant effects of psychedelic drugs. We discuss conceptual and methodological issues, the importance of using clinically relevant doses and the need to consider possible sex differences in preclinical psychedelic studies. [ABSTRACT FROM AUTHOR]

Psychedelics, including ketamine, 3,4-Methyl enedioxy methamphetamine (MDMA), and psilocybin, have gained attention for their potential therapeutic role in mental health treatment. While recreational use is prohibited in Canada, medicinal exemptions can be granted. There are several psychedelic clinics in Ontario, Canada, promoting the use of psychedelics for a variety of medical indications. Our objective was to identify the indications for which psychedelics are being prescribed in Ontario clinics and assess the quality of evidence used to support these claims. Internet searches were conducted using Google and Bing to identify psychedelic clinics in Ontario. Inclusion criteria was as follow: clinics were physically located in Ontario, had a functioning website link, and demonstrated involvement of a licensed physician or nurse practitioner. Identified clinics were evaluated for their claims of effectiveness, the quality of evidence used to support these claims, and statements on psychedelic-related harms. The cited studies were appraised for quality using Oxford Centre for Evidence-Based Medicine Levels of Evidence, "level 5" being the lowest quality and "level 1" being the highest quality. Out of 200 search results, 10 psychedelic clinic websites met our inclusion criteria. These clinics advertised psychedelics for 47 medical conditions, most commonly for depression. Only 2 out of 10 clinics described potential risks associated with psychedelic use. There were 29 studies cited by these websites, majority coming from "level 4" evidence consisting of case-series and case-control studies. Overall, the cited evidence quality was low to moderate. Psychedelic clinics in Ontario promote a wide range of medical indications for psychedelics using primarily low to moderate "level 4" evidence. There is limited information shared on the potential adverse effects of psychedelics. Our study emphasizes the importance of using transparent and high-quality evidence by clinics and clinicians to ensure safe and effective use of psychedelics in mental health treatments. [ABSTRACT FROM AUTHOR]

Psilocybin, the natural hallucinogen from Psilocybe (magic) mushrooms, is a highly promising drug candidate for the treatment of depression and several other mental health conditions. Biosynthesis of psilocybin from the amino acid l‐tryptophan involves four strictly sequential modifications. The third of these, ATP‐dependent phosphorylation of the intermediate 4‐hydroxytryptamine, is catalysed by PsiK. Here we present a crystallographic analysis and a structure‐based mutagenesis study of this kinase, providing insight into its mode of substrate recognition. The results of our work will support future bioengineering efforts aimed at generating variants of psilocybin with enhanced therapeutic properties. [ABSTRACT FROM AUTHOR]

\nPlain Language SummaryResults from clinical trials show that serotonergic psychedelics have efficacy in treating psychiatric disorders, where currently approved pharmacotherapies are inadequate. Developing psychedelic medicines, however, comes with unique challenges, such as tempering heightened anxiety associated with the psychedelic experience. We conceived a new strategy to potentially mitigate psychedelic effects with defined electromagnetic signals (ES). We recorded the electromagnetic fields emitted by the serotonin 2 receptor (5-HT2R) agonist (±)-2,5-dimethoxy-4-iodoamphetamine (DOI) and converted them to a playable WAV file. We then exposed the DOI WAV ES to mice to assess its effects on the DOI-elicited, 5-HT2AR dependent head-twitch response (HTR). The DOI WAV signal significantly attenuated the HTR in mice elicited by 0.1 and 0.3 mg/kg subcutaneous DOI (p < 0.05 and p < 0.01, respectively). A scrambled WAV signal did not affect the DOI-elicited HTR, suggesting specificity of the DOI WAV signal. These results provide evidence that defined ES could modulate the psychoactive effects of serotonergic psychedelics. We discuss putative explanations for the distinct effects of the DOI WAV signal in the context of previous studies that demonstrate ES’s efficacy for treating other conditions, including pain and cancer.Numerous clinical studies demonstrate that psychedelic drugs can treat psychiatric disorders. A challenge with psychedelic drugs is that they can elicit distressing experiences, which require psychological support in some patients. Recent developments have allowed for the recording of the electromagnetic shell or field of molecules in solution. These electromagnetic signals (ES) can be emitted (as a magnetic field) to emulate the effects of the recorded drug. By using ES, we have the potential to manage or mitigate the negative effects of a drug, simply by turning off the magnetic field. The main target of serotonergic psychedelic drugs is the serotonin receptor, 5-HT2A. A reliable and well-studied drug used in psychedelic research is (±)-2,5-dimethoxy-4-iodoamphetamine (DOI). DOI binds and activates the 5-HT2A receptor. DOI is known to elicit head twitching in mice (called the head-twitch response or HTR) that is indicative of 5-HT2A receptor activation. A recording of DOI was played to evaluate its effect on the head-twitch response in mice. Here we report that the DOI WAV signal decreased the head-twitch response observed after treating mice with the DOI drug. The effects were measurable, reproducible and demonstrated the ability of the DOI recording to dampen the head-twitch response. This WAV recording has the potential to interfere with the unwanted effects of psychedelics, making their use safer. [ABSTRACT FROM AUTHOR]

This meta-analysis investigates the effect of classic psychedelic drugs on empathy and focuses on cognitive and emotional empathy measured using the Multifaceted Empathy Test (MET). Empathy entails the ability to understand and share the feelings of another and is a significant component of social interaction. Several studies have examined the effects of psychedelic drugs such as LSD, psilocybin and ayahuasca on empathy, yet their overall effect has not been studied so far. In this meta-analysis, we reviewed data from studies up to November 2023 with the aim of examining the effects of various psychedelic drugs on empathic abilities broadly. Our findings suggest that classical psychedelics significantly enhance explicit and implicit emotional empathy without affecting measures of cognitive empathy. The results emphasize the need to continue testing the therapeutic potential of classic psychedelic drugs. [ABSTRACT FROM AUTHOR]

Psychedelics have a complex history marked by traditional use among indigenous cultures, early scientific interest, and subsequent prohibition. Despite their classification as controlled substances, recent decades have witnessed a resurgence of research into their therapeutic potential for various mental health conditions. However, most studies have focused on controlled clinical settings, leaving a significant gap in understanding how these substances are used in naturalistic contexts, particularly in Latin America. This study investigates the regular use of macrodoses of psychedelics among Latin American adults. We aimed to characterize the sociodemographic profiles, consumption practices, and subjective effects experienced by individuals who use psychedelics regularly. Data were collected via an online survey from 4,270 participants across several Latin American countries. Results indicated a diverse user base with varied motivations, predominantly psychological and spiritual well-being. The most frequently used substance was psilocybin mushrooms, with significant associations found between demographic variables and specific psychedelics used. The study provides new insights into the naturalistic use of psychedelics in Latin America, highlighting the need for informed, safe, and legal use frameworks. [ABSTRACT FROM AUTHOR]

AbstractBackgroundMethodsResultsConclusionsCurrently, there are great hopes for psychedelic substances in treating psychiatric conditions and improving well-being. These substances are illegal in many countries, and we lack knowledge of how conflicting discourses shape psychedelic use in naturalistic settings. This study explores how psilocybin use is made meaningful by participants and staff at a retreat including psychedelic ceremonies aimed at personal growth.Ethnographic fieldwork was conducted at a psychedelic retreat with participants from Sweden. The material was organized using Zinberg’s model of drug, set, and setting. Theoretical work related to comparisons was utilized to elucidate how psilocybin use was distinguished from other illicit drug use.The participants’ desires to be fundamentally transformed, combined with the staff’s staging of the setting as a haven primed the participants to approach psilocybin as an inherently benevolent substance. Positive experiences during the ceremonies were attributed to the substance, and negative experiences to personal shortcomings.The staff and participants combined different discourses to define the meaning of psilocybin, all of which condemned using it for purely recreational purposes. The psilocybin use at the retreat was considered an improvement and wholly unrelated to illegal drug use, dissociating this practice from such use to establish legitimate transgression. [ABSTRACT FROM AUTHOR]

Psychedelic therapies are an emerging class of treatments in psychiatry with great potential, however relatively little is known about their interactions with other commonly used psychiatric medications. As psychedelic therapies become more widespread and move closer to the clinic, they likely will need to be integrated into existing treatment models which may include one or more traditional pharmacological therapies, meaning an awareness of potential drug-drug interactions will become vital. This commentary outlines some of the issues surrounding the study of drug-drug interactions of this type, provides a summary of some of the relevant key results to date, and charts a way forward which relies crucially on multimodal neuroimaging investigations. Studies in humans which combine Positron Emission Tomography (PET) and functional Magnetic Resonance Imaging (fMRI), plus ancillary measures, are likely to provide the most comprehensive assessment of drug-drug interactions involving psychedelics and the relevant effects at multiple levels of the drug response (molecular, functional, and clinical). [ABSTRACT FROM AUTHOR]

Background: Psilocybin is a psychedelic 5HT2A receptor agonist found in "magic mushrooms". Recent studies have indicated that 5HT2A agonists, such as dimethyltryptamine, given before middle cerebral artery occlusion (MCAo), improve staircase behavior, increased BDNF expression, and reduce brain infarction in stroke rats. The objective of this study is to determine the protective effect of psilocybin in cellular and animal models of stroke. Methods: Adult male and timed-pregnant Sprague-Dawley rats were used for this study. The neural protective effects of psilocybin were determined in primary rat cortical neurons and adult rats. Rats were subjected to a 60-min middle cerebral artery occlusion. Brain tissues were collected for histological and qRTPCR analysis. Results: Psilocybin reduced glutamate-mediated neuronal loss in rat primary cortical neuronal cultures. Psilocybin-mediated protection in culture was antagonized by the BDNF inhibitor ANA12. Pretreatment with psilocybin reduced brain infarction and neurological deficits in stroke rats. Early post-treatment with psilocybin improved locomotor behavior, upregulated the expression of MAP2 and synaptophysin, and down-regulated the expression of IBA1 in the stroke brain. ANA12 significantly attenuated psilocybin-mediated reduction in brain infarction and improvements in locomotor behavior. Conclusions: Psilocybin reduced brain infarction and improved locomotor behavior in stroke rats; the protective mechanisms involve regulating BDNF expression. Our data support a novel therapeutic approach of psilocybin in stroke. Highlights: Psilocybin reduced glutamate-mediated neuronal loss in primary cortical neuronal cultures. ANA12 reduced psilocybin-mediated protection in culture. Psilocybin reduced brain infarction, reduced neurological deficits, and increased locomotor behavior in stroke rats. Psilocybin enhanced the expression of MAP2 and synaptophysin, and down-regulated IBA1 in the stroke rat brain. [ABSTRACT FROM AUTHOR]

Recent years have witnessed an unprecedented increase in the search for the use of psychedelics in improving physical and mental health. Anaesthesia has evolved since very early times, born from the need to eliminate pain and reduce suffering and there are reports of the use of anaesthetics to achieve mystical states since the nineteenth century. Nowadays, the renaissance of psychedelics in anaesthesia has been inspired by their potential in the treatment of chronic pain syndromes, palliative care and in the emergency department and pre‐hospital care with the administration of psychedelics in cases of ischaemia, given their potential in neuroprotection. Although there are already some published protocols for the administration of psychedelics in patients with mental illness, little has been addressed concerning non‐mental medical applications. In this sense, in patients with multiple comorbidities, functional limitations and polymedicated, the anaesthetist may play a fundamental role, not only in clinical practice, but also in translational research.This article focuses on the description of psychedelics, with a particular focus on dimethyltryptamine (DMT) and ayahuasca pharmacology, effects, safety and toxicity. A detailed description of the role of the anaesthetist in clinical and experimental research is provided, from participant's screening to preparation and dosing session, expected adverse effects and how to manage them, based on the protocol and standard procedures of a current study with neuroimaging during the psychedelic experience. Specific considerations regarding the management of psychedelic toxicity are also provided as well as future directions for safe psychedelic use in clinical practice. [ABSTRACT FROM AUTHOR]

Psychedelic drugs have profound effects on perception, cognition and mood. How psychedelics affect neural signaling to produce these effects remains poorly understood. We investigated the effect of the classic psychedelic psilocybin on neural activity patterns and spatial encoding in the retrosplenial cortex of head‐fixed mice navigating on a treadmill. The place specificity of neurons to distinct locations along the belt was reduced by psilocybin. Moreover, the stability of place‐related activity across trials decreased. Psilocybin also reduced the functional correlation among simultaneously recorded neurons. The 5‐HT2AR (serotonin 2A receptor) antagonist ketanserin blocked these effects. These data are consistent with proposals that psychedelics increase the entropy of neural signaling and provide a potential neural mechanism contributing to disorientation frequently reported by humans after taking psychedelics. [ABSTRACT FROM AUTHOR]

Background: The emergence of New Psychoactive Substances (NPS), including synthetic psilocybin, has raised concern among health experts due to the numerous health and socioeconomic consequences. The current trend is shifting to the hazardous use of synthetic psilocybin in vaping, and little is known about the prevalence of use, specifically among amphetamine-type stimulants (ATS) users. Methods: Interviewer-administered questionnaires were conducted in drug detention centers between March and October 2022. The study was conducted using ASSIST 3.0 and obtained information on the respondents' socio-demographic characteristics and clinical profiles. N = 355 ATS users were enrolled in this study. Results: The results show a high prevalence of psilocybin vaping among ATS users (182/355, 53.1%). Most of the respondents were males (85.1%) and unmarried (69.3%), with a mean age of 29.2 (SD = 7.3). Across all respondents, five factors were associated with psilocybin vaping: tobacco smoking, aOR =5.790 (95% CI: 1.723, 8.183); cannabis uses, aOR= 9.152 (95% CI: 2.693, 10.396); and alcohol use, aOR= 3.137 (95% CI: 1.461, 5.817). Respondents of the Malay race had higher odds of being involved in psilocybin vaping compared to other races, with aOR= 1.638 (0.043, 2.459). Meanwhile, a reduction in age by 1.9 will increase the likelihood of involvement in psilocybin vaping with aOR = 1.897 (95% CI: 0.857, 1.938). Conclusion: Psilocybin in vaping is growing among ATS users and across all populations. Unfortunately, knowledge regarding the long-term effects on health is limited. Further studies should highlight the harmful effects of psilocybin and the potential risk of psilocybin vaping among the younger population. [ABSTRACT FROM AUTHOR]

Background: In recent years, both meditation and psychedelics have attracted rapidly increasing scientific interest. While the current state of evidence suggests the promising potential of psychedelics, such as psilocybin, to enhance meditative training, it remains equivocal whether these effects are specifically bound to psilocybin or if other classical psychedelics might show synergistic effects with meditation practice. One particularly promising candidate is N,N -dimethyltryptamine (DMT), an active ingredient of ayahuasca. Aim: This study aims to investigate the effect of the psychedelic substance DMT, combined with the monoamine oxidase inhibitor harmine (DMT-harmine), on meditative states, compared to meditation with a placebo. Method: Forty experienced meditators (18 females and 22 males) participated in a double-blind, placebo-controlled study over a 3-day meditation retreat, receiving either placebo or DMT-harmine. Participants' levels of mindfulness, compassion, insight, and transcendence were assessed before, during, and after the meditation group retreat, using psychometric questionnaires. Results: Compared to meditation with a placebo, meditators who received DMT and harmine self-attributed greater levels of mystical-type experiences, non-dual awareness, and emotional breakthrough during the acute substance effects and, when corrected for baseline differences, greater psychological insight 1 day later. Mindfulness and compassion were not significantly different in the DMT-harmine group compared to placebo. At 1-month follow-up, the meditators who received DMT and harmine rated their experience as significantly more personally meaningful, spiritually significant, and well-being-enhancing than the meditators who received placebo. Conclusion: Investigating the impact of DMT-harmine on meditators in a naturalistic mindfulness group retreat, this placebo-controlled study highlights the specific effects of psychedelics during meditation. Trial registration: ClinicalTrials.gov identifier NCT05780216. [ABSTRACT FROM AUTHOR]

Background: Psychedelic-assisted therapy (PAT) is permitted in Switzerland under its limited medical use program. Data from patients in this program represent a unique opportunity to analyze the real-world practice of PAT. Aims: This study compared the subjective effects of lysergic acid diethylamide (LSD) and psilocybin between patients undergoing PAT and healthy volunteers. For the patients, it also investigated the relationship between antidepressant effects and six measures of acute drug effects. Methods: We compared data on acute psychedelic drug effects between 28 PAT patients with data from 28 healthy participants who participated in a randomized, double-blind crossover trial. All participants received varying doses of psilocybin and LSD. Subjective effects were assessed on an hourly basis during the acute drug effects, and the Mystical Experience Questionnaire (MEQ) was completed retrospectively. For patients, depressive symptoms were assessed using the Montgomery-Åsberg Depression Rating Scale (MADRS). Results: Ratings of overall drug effect and mystical experience were similar across groups. Compared with healthy controls, patients reported lower ratings of ego dissolution. Patients showed a significant decrease in MADRS scores, and the greatest predictor of antidepressant outcome was relaxation during the PAT session. We did not observe a relationship between mystical-type experiences and antidepressant effects. Most patients experienced mild adverse effects which resolved within 48 h. Conclusion: PAT reduced depressive symptoms in this heterogeneous patient group. Patients may experience more challenging psychedelic effects and reduced ego dissolution. Hourly assessment of drug effects may predict clinical outcomes better than retrospectively assessed mystical experiences, and the impact of relaxation during PAT should be investigated further. [ABSTRACT FROM AUTHOR]

Background: Non-ordinary states of consciousness induced by psychedelics can be accompanied by so-called "peak experiences," characterized at the emotional level by their intensity and positive valence. These experiences are strong predictors of positive outcomes following psychedelic-assisted therapy, and it is therefore important to better understand their biology. Despite growing evidence that the autonomic nervous system (ANS) plays an important role in mediating emotional experiences, its involvement in the psychedelic experience is poorly understood. The aim of this study was to investigate to what extent changes in the relative influence of the sympathetic (SNS) and parasympathetic nervous systems (PNS) over cardiac activity may reflect the subjective experience induced by the short-acting psychedelic N,N-Dimethyltryptamine (DMT). Methods: We derived measures of SNS and PNS activity from the electrocardiograms of 17 participants (11 males, mean age = 33.8 years, SD = 8.3) while they received either DMT or placebo. Results: Results show that the joint influence of SNS and PNS ("sympathovagal coactivation") over cardiac activity was positively related to participants' ratings of "Spiritual Experience" and "Insightfulness" during the DMT experience, while also being related to improved well-being scores 2 weeks after the session. In addition, we found that the state of balance between the two ANS branches ("sympathovagal balance") before DMT injection predicted scores of "Insightfulness" during the DMT experience, as well as subsequent sympathovagal coactivation. Conclusion: These findings demonstrate the involvement of the ANS in psychedelic-induced peak experiences and may pave the way to the development of biofeedback-based tools to enhance psychedelic therapy. [ABSTRACT FROM AUTHOR]

Background: The applications of psilocybin, derived from 'magic mushrooms,' are vast, including a burgeoning practice known as microdosing, which refers to the administration of sub-hallucinogenic doses of psychedelic substances to obtain benefits without experiencing significant cognitive and perceptual distortion. However, current research is fairly new with several limitations and gaps that hinder adequate conclusions on its efficacy. Aims: This semi-structured review aimed to identify and highlight research gaps in the field of psilocybin microdosing for future research. Methods: A Preferred Reporting Items for Systematic Reviews and Meta-Analyses based strategy was employed, utilizing a chain of keywords and key phrases across multiple databases, augmented by a cross-sectional Google search for relevant grey literature in the form of the top 10 search results. A total of 40 studies and 8 unique websites were identified, summarized and tabulated into four distinct categories, namely non-clinical, clinical, observational and anecdotal evidence. Results: The majority of available evidence originates from observational studies, while non-clinical and clinical study findings remain comparatively sparse and inconsistent. Web-based findings were consistent with current research findings. Key research gaps were highlighted: the imperative for more randomized placebo-controlled trials, exploration of dose-response ranges, psychological and personality testing of participants, utilization of active placebos, greater diversity in study populations, an increase in psilocybin-exclusive microdosing studies and the refinement of animal models. Conclusion: Definitive conclusions regarding the efficacy of psilocybin microdosing remain elusive, emphasizing the need for further study. Numerous research gaps necessitate consideration for future investigations. [ABSTRACT FROM AUTHOR]

Background: Psychedelic drugs have been of interest in medicine since the early 1950s. There has recently been a resurgence of interest in psychedelics. Aims: The objective of this study is to determine the extent of the available literature on psilocybin for medical indications including the designs used, study characteristics, indications studied, doses, and authors' conclusions. We identify areas for further study where there are research gaps. Methods: We conducted a systematic scoping review of clinical indications for psilocybin, encompassing psychiatric and medical conditions. We systematically searched Medline and Embase using keywords related to psilocybin. We reviewed titles and texts in duplicate using Covidence software. We extracted data individually in duplicate using Covidence software and a senior reviewer resolved all author conflicts. We analyzed data descriptively. Results: We included 193 published and 80 ongoing studies. Thirty-seven percent of included studies were systematic reviews. Only 12% of included studies were randomized controlled trials. The median number of participants was 22 with a median of 18 participants who had taken psilocybin. Thirty-eight percent of studies reported at least one potential conflict of interest. The most common indication was depression (28%). Also commonly studied were substance use (14%), mental health in life-threatening illness (9%), headaches (6%), depression and anxiety (6%), obsessive-compulsive disorder (3%), and anxiety disorders (3%). Conclusions: Most studies involving the administration of psilocybin have small sample sizes and the most common focus has been psychiatric disorders. There is a need for high-quality randomized trials on psilocybin and to expand consideration to other promising indications, such as chronic pain. [ABSTRACT FROM AUTHOR]

Background: Psychedelic substances reliably induce marked altered states of consciousness (ASC), which may be important for lasting effects and clinical outcomes of psychedelic intervention. Several instruments are available to measure the acute psychedelic experience, of which the Five Dimensional Altered States of Consciousness Questionnaire (5D-ASC) is commonly used. The questionnaire can be scored and analyzed as having five dimensions or 11 subscales, but the two have not been evaluated with comparable factor analysis methods. Methods: The Danish translation of the 5D-ASC was completed by one sample of healthy volunteers receiving psilocybin in a laboratory setting (N = 47) and one sample of recreative users5D-ASC of psychedelics (N = 550), who reported retrospectively through an online survey based on their most recent experience with psilocybin. We calculated internal consistency measures of Cronbach's alpha and McDonald's omega, conducted a confirmatory factor analysis of the previously suggested factor structures, and tested for possible associations between the 5D-ASC total scores and dose, setting, and intention. For the 11 subscales, we reported omega-sem (composite reliability) using the parameters of the fitted confirmatory factor analyses model. Results: Confirmatory factor analysis showed that the 11 subscales had a good fit to data and showed a better fit compared to the originally proposed five-dimensional solution and good internal consistencies. We further found that the 5D-ASC total scores correlated positively with the dose in the recreative sample. We found no correlations between 5D-ASC total scores and intention or setting. Discussion: We find the Danish 5D-ASC to be a valid tool for measuring ASC among Danish-speaking individuals. [ABSTRACT FROM AUTHOR]

Artificial intelligence (AI) and psychedelic medicines are among the most high‐profile evolving disruptive innovations within mental healthcare in recent years. Although AI and psychedelics may not have historically shared any common ground, there exists the potential for these subjects to combine in generating innovative mental health treatment approaches. In order to inform our perspective, we conducted a scoping review of relevant literature up to late August 2024 via PubMed intersecting AI with psychomedical use of psychedelics. Our perspective covers the potential application of AI in psychedelic medicine for: drug discovery and clinical trial optimization (including pharmacodynamics); study design; understanding psychedelic experiences; personalization of treatments; clinical screening, delivery, and follow‐up (potentially delivered via chatbots/apps); application of psychological preparation, integration, and general mental health support; its role in enhancing treatment via brain modulatory devices (including virtual reality and haptic suits); and the consideration of ethical and security safeguards. Challenges include the need for sufficient data protection and security, and a range of necessary ethical protections. Future avenues of exploration could involve directly administering psychedelics (or providing algorithm‐generated effects) to inorganic AI‐interfaced neural networks that may exceed human brain activity (i.e., cognitive capacity) and intelligence. [ABSTRACT FROM AUTHOR]

Psilocybin is a classic psychedelic with demonstrated preliminary clinical efficacy in a range of psychiatric disorders. Evaluating the impact of psilocybin on cognitive function is essential to unravel its potential benefits and risks. In this systematic review, we assessed psilocybin's effect on cognitive function through a comprehensive search of electronic databases from inception to January 2024, identifying 20 articles involving 2,959 participants. While 85% of studies were conducted in healthy volunteers, most of these studies (85%) used macrodoses, ranging from 45 μg/kg to 30 mg/70 kg. Various cognitive aspects were evaluated and yielded mixed results. Global cognitive function, and processing speed remained mostly unchanged in healthy individuals; However, a limited number of studies reported improvements in certain areas such as sustained attention, working memory, and executive function especially in patients with treatment‐resistant depression (TRD). Emotional processing was positively modified, particularly in TRD patients. Psilocybin was observed to enhance emotional empathy without significantly altering cognitive empathy and social cognition. Cognitive flexibility and creative cognition were noted to initially decline but could potentially improve over time. Additionally, with respect to learning and memory skills, psilocybin showed promise in improving specific memory types such as semantic associations and associative learning, while its effects on episodic and verbal memory have been less pronounced compared to other cognitive enhancers. The observed mixed findings underscore the complexity of psilocybin's cognitive influence. Further research is essential to provide a clearer understanding of psilocybin's impact on cognitive domains and to guide the development of safe and effective interventions. [ABSTRACT FROM AUTHOR]

This brief review highlights some of the structure–activity relationships of classic serotonergic psychedelics. In particular, we discuss structural features of three chemotypes: phenethylamines, ergolines and certain tryptamines, which possess psychedelic activity in humans. Where they are known, we point out the underlying molecular mechanisms utilized by each of the three chemotypes of psychedelic molecules. With a focus on the 5‐HT2A receptor subtype, a G‐protein coupled receptor known to be the primary target of psychedelics, we refer to several X‐ray and cryoEM structures, with a variety of ligands bound, to illustrate the underlying atomistic basis for some of the known pharmacological observations of psychedelic drug actions. [ABSTRACT FROM AUTHOR]

Objective: Despite rapid advances in psychedelic sciences and the increasing number of countries legalizing psychedelics for the treatment of mental illnesses, the attitudes, knowledge and readiness of both mental health consumers and the general population remain largely unknown. Methods: A cross-sectional survey was conducted among Australians, targeting individuals with mental illness as potential mental health service users. A sub-sample of individuals free of mental illness was also surveyed to assess attitudes in the general population. Participants completed the Attitudes on Psychedelics Questionnaire, the Basic Knowledge of Psychedelics Test and a questionnaire by Corrigan et al. to capture attitudes toward psychedelic therapy by mental health service users. Results: Of the 502 respondents, 64.5% self-identified as having a mental illness. A significant proportion favored legalizing psychedelics for medical use (43%) and were open to their use (52.4%), yet fewer viewed their effects positively (24%) or considered them safe (33%). Most participants reported to be psychedelic naive (61%). Participants with mental illness had significantly more experience with psychedelics than participant free of mental illness (44.1% vs 29.7%). Experience, perceived knowledge and actual knowledge significantly predicted attitudes toward legalization, effects, risks and openness to psychedelics. Conclusions: While a large proportion of Australians are in favor of legalizing psychedelics for medical purposes, concerns about safety remain. People with self-identified mental illness, those with previous recreational psychedelic experience and those with greater knowledge of psychedelics were more likely to have positive attitudes toward psychedelics and psychedelic-assisted therapy. [ABSTRACT FROM AUTHOR]

This document is a compilation of summaries of four different articles from various medical journals. The first article discusses the use of a two-bag N-acetylcysteine (NAC) system for acetaminophen poisoning, comparing its effectiveness and safety to the FDA-approved three-bag system. The second article examines the use of physostigmine in the treatment of anticholinergic toxicity, finding that patients treated with physostigmine alone were less likely to be intubated. The third article explores the use of dexmedetomidine in non-intubated patients, concluding that it is a safe and useful adjunct in the care of agitated toxicological patients. The fourth article compares the acute effects of mescaline, lysergic acid diethylamide (LSD), and psilocybin in a randomized, double-blind, placebo-controlled study, finding that the subjective experiences were similar at the studied doses. These articles provide valuable insights for toxicologists and poison centers in the treatment of various toxicological conditions. [Extracted from the article]

Mental health disorders and substance use disorders (SUDs) in particular, contribute greatly to the global burden of disease. Psychedelics, including entactogens and dissociative substances, are currently being explored for the treatment of SUDs, yet with less empirical clinical evidence than for other mental health disorders, such as depression or post-traumatic stress disorder (PTSD). In this narrative review, we discuss the current clinical research evidence, therapeutic potential and safety of psilocybin, lysergic acid diethylamide (LSD), ketamine, 3,4-methylenedioxymethamphetamine (MDMA) and ibogaine, particularly in the context of the SUD treatment. Our aim was to provide a balanced overview of the current research and findings on potential benefits and harms of psychedelics in clinical settings for SUD treatment. We highlight the need for more clinical research in this particular treatment area and point out some limitations and challenges to be addressed in future research. [ABSTRACT FROM AUTHOR]

Background and Purpose: Demand for new antidepressants has resulted in a re‐evaluation of the therapeutic potential of psychedelic drugs. Several tryptamines found in psilocybin‐containing "magic" mushrooms share chemical similarities with psilocybin. Early work suggests they may share biological targets. However, few studies have explored their pharmacological and behavioural effects. Experimental Approach: We compared baeocystin, norbaeocystin and aeruginascin with psilocybin to determine if they are metabolized by the same enzymes, similarly penetrate the blood–brain barrier, serve as ligands for similar receptors and modulate behaviour in rodents similarly. We also assessed the stability and optimal storage and handling conditions for each compound. Key Results: In vitro enzyme kinetics assays found that all compounds had nearly identical rates of dephosphorylation via alkaline phosphatase and metabolism by monoamine oxidase. Further, we found that only the dephosphorylated products of baeocystin and norbaeocystin crossed a blood–brain barrier mimetic to a similar degree as the dephosphorylated form of psilocybin, psilocin. The dephosphorylated form of norbaeocystin was found to activate the 5‐HT2A receptor with similar efficacy to psilocin and norpsilocin in in vitro cell imaging assays. Behaviourally, only psilocybin induced head twitch responses in rats, a marker of 5‐HT2A‐mediated psychedelic effects and hallucinogenic potential. However, like psilocybin, norbaeocystin improved outcomes in the forced swim test. All compounds caused minimal changes to metrics of renal and hepatic health, suggesting innocuous safety profiles. Conclusions and Implications: Collectively, this work suggests that other naturally occurring tryptamines, especially norbaeocystin, may share overlapping therapeutic potential with psilocybin, but without causing hallucinations. [ABSTRACT FROM AUTHOR]

Psychedelic medicine is currently being evaluated for numerous mental health indications, and there is significant interest in applying these models of care to eating disorders (EDs) given the limited efficacy of available treatment models, especially for those living with anorexia nervosa. Preliminary findings across a number of studies suggest promise. In this commentary, researchers with experience in psychedelics and EDs present a rationale and considerations for the application of psychedelic medicine, including psychedelic-assisted therapy (PAT) for EDs. These contributions are informed by those with lived experience as well as the authors' experiences in the field. By addressing underlying psychological and transpersonal factors and improving treatment engagement, psychedelic medicine, though not without risks, may offer a valuable adjunct to existing treatments, enhancing overall outcomes for some living with an ED. This commentary also aims to provide a multi-dimensional perspective to inform the field, including with respect to the etiology of these illnesses, as psychedelic medicine becomes more accessible in naturalistic, research and clinical settings. [ABSTRACT FROM AUTHOR]

There are profound methodological challenges facing microdosing research. One way we can address some of these methodological issues is by understanding how psilocybin microdosing fits in the broader existential context of people’s lives. We recruited participants who underwent psilocybin microdosing on their own and consented to being monitored for harm mitigation purposes. We combined momentary ecological assessment and detailed retrospective interviews. Participants reported loosening of mental structures (i.e., less intense strength of thoughts, tangential stream of consciousness), increased salience of external stimuli (varyingly associated with greater interest in otherwise mundane activities, as well as sensory overload), an increase in flexible cognition, a decrease in stable cognition, and various ego-dystonic contents. Highly structured environments were conducive to positive appraisal of experiences and vice versa. Momentary ecological assessment and retrospective interviews yielded differing accounts of microdosing experience. We relate our findings to stable and flexible cognition, as well as the notion of salience. We point out the necessity for systematic mixed methods studies to better characterize the lived experience of taking low doses of psilocybin. [ABSTRACT FROM AUTHOR]

Background Aim and Objectives Method Findings Conclusions Research on psychedelics centres on two key areas: the action of psychedelics on the brain and the protocol for delivering therapy. There is little research that considers the implications of this novel therapy on the therapist delivering the treatment. This research study sought to explore this.The aim of this research was to explore the considerations for psychotherapists interested in delivering psychedelic therapy. Objectives were to examine the therapeutic conditions needed for effective outcomes, to explore the perceived differences between the practice of standard psychotherapy and psychedelic therapy and to determine the challenges for therapists working in the field.Six semi‐structured interviews were conducted with therapists who work in clinical or retreat settings. Interview transcripts were analysed using qualitative thematic analysis.Three themes emerged that highlight the importance of preparation for effective clinical outcomes, the differences in standard and psychedelic practice and the personal and professional implications for therapists.The results highlighted challenges and revealed the need for clear protocols for integrating psychedelics into psychotherapy practice. [ABSTRACT FROM AUTHOR]

Psychedelic-assisted therapy (PAT) has shown preliminary efficacy for psychiatric and physical health conditions. Although some people report naturalistic psychedelic use with so-called “underground” practitioners, little is known about PAT that occurs outside of controlled clinical settings or perspectives of these practitioners. We conducted an anonymous online survey of individuals who reported providing psychedelic support services (e.g. trip sitting and/or preparatory/follow-up psychotherapy) in naturalistic settings. We investigated demographics, including education and licensing, details about services provided, and reported client outcomes. Among 107 participants, 40.2% held a full or in-progress license and 44.9% had not obtained a relevant graduate degree. Almost all participants reported pre-screening clients before treatment, offering preparation, integration, and trip-sitting services, and most employed a range of therapeutic modalities, centering primarily on non-directive approaches. Participants reported that clients most commonly consumed psilocybin, and treated numerous conditions, primarily aligning with indications targeted in psychedelic clinical research. Perceptions of clients’ symptom changes were largely positive, although a small proportion reported worsened personality disorder symptoms. Further research delineating client and practitioner perspectives of naturalistic PAT services is warranted, and such work may shed light on the benefits and risks specific to naturalistic PAT as well as inform best practices for practitioners. [ABSTRACT FROM AUTHOR]

Background Methods Results Conclusion Short‐lasting unilateral neuralgiform headache attacks (SUNHA) are trigeminal autonomic cephalalgias that feature intense and recurrent paroxysms of pain and autonomic symptoms. Many patients are left with debilitating symptoms despite best‐available treatment. Psychedelics, such as the serotonin 2A partial agonist psilocybin, have shown promise in related disorders such as migraine and cluster headache. In this open‐label phase Ib ascending dose study, we aimed to assess the effects of low‐dose oral psilocybin with psychological support in six to 12 patients with chronic SUNHA. Study objectives were to determine effects on cognition, as well as safety, tolerability, and effects on headache severity and frequency.Oral psilocybin in ascending doses of 5, 7.5, and 10 mg (one dose per session; three dosing sessions in total) were administered. Cognition was assessed via the Cambridge Neuropsychological Tests Automated Battery. Headache attacks were assessed via headache diaries and the six‐item Headache Impact Test (HIT‐6). Subjective dose intensity was assessed via the five‐Dimensional Altered States of Consciousness Questionnaire (5D‐ASC). The study was terminated early due to recruitment difficulties; four patients were enrolled, three of whom were study completers. Post hoc, we undertook a thematic analysis of the applicable free‐text clinical trial notes from the dosing and subsequent visits (n = 22). An inductive method was employed to establish emergent themes.No significant adverse events were recorded. We were unable to collect data as planned on cognitive function during the acute experience due to high ratings of subjective dose intensity (mean 5D‐ASC scores 37.8–45.7). The impact of the headaches remained severe throughout the duration of the trial (HIT‐6 mean scores 64.3–65.7). There were limited effects on headache duration and severity based on the diaries; however, mean daily attack frequency decreased by >50% in two participants at final follow‐up (22.9 to 11.0 and 56.4 to 28.0, respectively). Completing participants and their clinicians recorded “much” (two participants) or “minimal” improvements (one participant) at final follow‐up via the Clinical Global Impression rating scale. Thematic analysis indicated that psychological insights were key features of participants’ experience; these insights included re‐configured relationships to their headache pain.The study met with recruitment difficulties and cognition could not be assessed during the acute experience due to subjective dose intensity, likely mediated in part by expectancy effects. The clinical results provide no conclusive evidence for the use of psilocybin in SUNHA. We suggest that accounting for psychological factors in chronic SUNHA may be an important facet of treatment. [ABSTRACT FROM AUTHOR]

Emerging legal frameworks in Oregon and Colorado license facilitators to support adults receiving psychedelic services. The current legal frameworks are silent regarding facilitators’ personal experience with psychedelics. An e-Delphi process recruited 36 experts with at least 5 years’ experience facilitating psilocybin experiences in ceremonial settings, indigenous practices, or clinical trials. Respondents completed in-depth, semi-structured qualitative interviews via secure web links. Interviews were recorded, transcribed, and analyzed using Thematic Analysis. Experts with a mean of 15.2 (SD 13.1) years’ experience providing psilocybin services expressed the importance of first-hand experience with psychedelics as a qualification for the emerging workforce. One participant questioned the necessity of personal psychedelic experience. Experts suggested that personal experience may indirectly support high-quality care because it enhances facilitators’ personal wellbeing, and may help facilitators understand the complexity and nature of their clients’ psychedelic experiences. Novel state-legal psychedelic paradigms create a real-world opportunity to assess associations between facilitators’ personal psychedelic experience and the safety and outcomes of psychedelic services. [ABSTRACT FROM AUTHOR]

We sought to identify patterns of psychedelic use among United States military veterans, compare demographic variables and perspectives of those who did and did not report use, and characterize benefits and adverse outcomes associated with use. Respondents (N = 426) were recruited to complete an online cross-sectional survey. Approximately one-half (51%) reported using psychedelics. Most did so for healing/treatment (70%) and/or spiritual purposes (48%), and most (85%) reported benefiting from use. Those who used psychedelics reported they would be more likely to use VA services (p < .001, d = 0.64) and to return to the VA for care (p < .001, d = 0.79) if psychedelic therapy was offered. Almost two-thirds (59%) reported adverse outcomes associated with use. Equivalent proportions rated their psychedelic experiences as beneficial among those who did (89%) and did not (81%) report adverse outcomes. Fewer adverse outcomes were associated with being older, using psilocybin, feeling prepared and confident in the reasons for use, being in a comfortable setting, and being able to “trust, let go, and be open” (Rc = 0.77; p < .001). Psychedelics may offer benefits but may also lead to adverse outcomes without proper preparation and support. Future research should examine the utility of psychedelic-based approaches for veteran mental health care. [ABSTRACT FROM AUTHOR]

• It emphasizes the critical importance of novel therapeutic approaches. • It is the first to discusses the functions of L-cysteine in the anxiety. • It provides an overview of the basic features of L-cysteine. • It presents potential mechanism of L-cysteine in the treatment of anxiety. • It reviews the pathogenesis and neuroanatomical basis of anxiety disorders. Anxiety disorders are prevalent chronic psychological disease with complex pathogenic mechanisms. Current anxiolytics have limited efficacy and numerous side effects in many anxiety patients, highlighting the urgent need for new therapies. Recent research has been focusing on nutritional supplements, particularly amino acids, as potential therapies for anxiety disorders. Among these, L-Cysteine plays a crucial role in various biological processes. L-Cysteine exhibits antioxidant properties that can enhance the antioxidant functions of the central nervous system (CNS). Furthermore, metabolites of L-cysteine, such as glutathione and hydrogen sulfide have been shown to alleviate anxiety through distinct molecular mechanisms. Long-term administration of L-Cysteine has anxiolytic, antidepressant, and memory-improving effects. L-Cysteine depletion can lead to increased oxidative stress in the brain. This review delves into the potential mechanisms of L-Cysteine and its main products, glutathione (GSH) and hydrogen sulfide (H2S) in the management of anxiety and related diseases. [ABSTRACT FROM AUTHOR]

Psilocybin, a major indole alkaloid found in magic mushrooms (Psilocybe cubensis), has recently drawn attention as a breakthrough therapy to treat major depressive disorder. This review aimed to summarize and identify knowledge gaps concerning their pharmacokinetic characteristics of psilocybin and its active metabolite, psilocin. Original studies related to pharmacokinetics of psilocybin conducted in vitro, animals, and humans were systematically collected from PubMed, Scopus, and ScienceDirect, from their inceptions to November 2023. Twenty articles were included in this work and assessed for study quality. A comprehensive review of the pharmacokinetics of psilocybin and psilocin in both animals and humans was performed. Psilocybin is considered a prodrug that is dephosphorylated to psilocin by alkaline phosphatase. Following ingestion, the peak psilocin plasma and brain levels were rapidly achieved in a dose-dependent manner. Psilocin is metabolized primarily through both Phase I and Phase II processes with the half-life of 2–3 hours. This review also identified lack of some pharmacokinetic related information and limitations of available research that may help direct future investigations to better understand the pharmacokinetics and improve study design including dose selection and dosage optimization. [ABSTRACT FROM AUTHOR]

Hallucinogenic mushrooms are used in France for recreational purposes, most often following festive gatherings. The clinical consequences of this consumption are not significant; They are mainly observed on a psychological level, but in certain cases, which are quite rare, require care by a health professional. However, it is important for the general practitioner to clearly determine the reasons for this type of addiction which can in certain cases be associated with other psychoactive substances which, in turn, can lead to serious organic problems, and in certain cases fatal. [ABSTRACT FROM AUTHOR]

There has been a resurgence of interest in the use of psychedelic therapies for several mental and substance use disorders. Psilocybin, a "classic" serotonergic psychedelic, has emerged as one of the primary compounds of interest in clinical research. While research on psilocybin's potential mental health benefits has grown, data on the safety and efficacy of other serotonergic psychedelics remain limited. A comprehensive scoping review on the use of mescaline, ibogaine, ayahuasca, N,N-dimethyltryptamine (DMT), and lysergic acid diethylamide (LSD) in the treatment of mental and substance disorders was conducted. Independent reviewers screened titles, abstracts, and full texts and conducted data extraction. Seventy-seven studies met the inclusion criteria. There were 43 studies of LSD, 24 studies of ayahuasca, 5 studies of DMT, 5 studies of ibogaine, and 5 studies of mescaline. Commonly reported benefits included improved mood and anxiety symptoms, improved insight, reduced substance use, improved relationships, and decreased vegetative symptoms. Commonly reported adverse effects were psychological, neurological, physical, and gastrointestinal in nature. Serious adverse events (homicide and suicide) were reported in published studies of LSD. In conclusion, there is only low-level evidence to support the safety and efficacy of non-psilocybin serotonergic psychedelics in individuals with mental and substance use disorders. [ABSTRACT FROM AUTHOR]

Despite the recent and sharp rise in psychedelic research, few studies have investigated how classic psychedelic use relates to employees' work-related outcomes. This is surprising given that the increased use, decriminalization, and legalization of classic psychedelics in the United States (U.S.) has the potential to impact both employees and their organizations. Addressing this gap, the current study explores how employees' lifetime psilocybin use relates to the amount of overtime they work, thereby offering insight into what current trends in psilocybin use could mean for businesses. Using pooled, cross-sectional data from the National Survey on Drug Use and Health (2002–2014) on 217,963 adults employed in the U.S. full-time, this study tests whether lifetime psilocybin use is associated with employees' number of overtime hours worked in the past week. After adjusting for sociodemographics and other substance use, a significant negative association is found between employees' lifetime psilocybin use and the amount of overtime they reported working. Specifically, the findings suggest that lifetime psilocybin use in the U.S. full-time working population is associated with an estimated 44,348,400 fewer overtime hours worked per year and may help explain recent findings linking employees' lifetime psilocybin use to a reduction in sick leave taken. [ABSTRACT FROM AUTHOR]

Few epidemiological studies have focused on seasonal variation in the use of common psychedelics and party drugs among nightclub and festival attendees, typically those who attend electronic dance music (EDM) events. We sought to determine whether the use of different drug types varies seasonally within this population. Across 15 seasons from summer 2017 through fall 2022, we surveyed 3,935 adults entering randomly selected nightclubs and festivals in New York City regarding their past-month use of cocaine, MDMA (3,4-methylenedioxymethamphetamine, commonly known as ecstasy), lysergic acid diethylamide (LSD), psilocybin (shrooms), and ketamine. Multivariable models were used to compare adjusted odds ratios for drug use within each season with the grand mean of combined seasons. Summer was associated with higher odds for use of LSD (aOR 2.72; 95% CI, 1.88–3.93) and psilocybin (aOR 1.65; CI, 1.12–2.43), independent of increases in psilocybin use over time (p <.001). A significant increase in use of ketamine (p =.014) and significant decreases in use of cocaine (p =.002) and ecstasy (p =.002) were found across time, but multivariable models did not detect seasonal variations. Summer is a risk factor for use of common psychedelics among people who attend EDM events. Therefore, the summer months may be the best time to disseminate information about harm reduction for psychedelic drug users. [ABSTRACT FROM AUTHOR]

This study translated and tested the psychometric properties of acute psychedelic effects measures among Spanish-speaking people. The Psychological Insight Questionnaire (PIQ), Challenging Experiences Questionnaire (CEQ), and Mystical Experiences Questionnaire (MEQ) were translated before being incorporated into a web-based survey. We recruited native Spanish-speakers (N = 442; Mage = 30.8, SD = 10.9; Latino/Latina = 62%; Hispanic = 91.4%; male = 71.5%) to assess their previous experience with one of two psychedelics (LSD = 58.4%; Psilocybin = 41.6%) and their acute and enduring effects. Confirmatory factor analysis (confirming factor structure based on the English version) revealed a good fit for the MEQ, PIQ and the CEQ. Repeating our analysis in each drug subsample revealed consistency in factor structure for each assessment tool. Construct validity was supported by significant positive associations between the PIQ and MEQ, and between the PIQ and MEQ and changes in cognitive fusion and negative associations between changes in prosocial behaviors. As a signal of predictive validity, persisting effects (PEQ) were strongly related to scores on the MEQ and PIQ. Findings demonstrate that the Spanish versions of these measures can be reliably employed in studies of psychedelic use or administration in Spanish-speaking populations. [ABSTRACT FROM AUTHOR]

Psilocybin is the main psychoactive compound found in hallucinogenic/magic mushrooms and can bind to both serotonergic and tropomyosin receptor kinase b (TrkB) receptors. Psilocybin has begun to show efficacy for a range of neuropsychiatric conditions, including treatment‐resistant depression and anxiety disorders; however, neurobiological mechanisms are still being elucidated. Clinical research has found that psilocybin can alter functional connectivity patterns in human brains, which is often associated with therapeutic outcomes. However, preclinical research affords the opportunity to assess the potential cellular mechanisms by which psilocybin may exert its therapeutic effects. Preclinical rodent models can also facilitate a more tightly controlled experimental context and minimise placebo effects. Furthermore, where there is a rationale, preclinical researchers can investigate psilocybin administration in neuropsychiatric conditions that have not yet been researched clinically. As a result, we have systematically reviewed the knowledge base, identifying 82 preclinical studies which were screened based on specific criteria. This resulted in the exclusion of 44 articles, with 34 articles being included in the main review and another 2 articles included as Supporting Information materials. We found that psilocybin shows promise as a lead candidate molecule for treating a variety of neuropsychiatric conditions, albeit showing the most efficacy for depression. We discuss the experimental findings, and identify possible mechanisms whereby psilocybin could invoke therapeutic changes. Furthermore, we critically evaluate the between‐study heterogeneity and possible future research avenues. Our review suggests that preclinical rodent models can provide valid and translatable tools for researching novel psilocybin‐induced molecular and cellular mechanisms, and therapeutic outcomes. [ABSTRACT FROM AUTHOR]

Substance use/abuse and suicide are two closely related phenomena, mostly due to neurobiological, psychological, and social impairments. In the present narrative review, the relationship between suicidal behavior (SB) and the use and abuse of common recreational drugs, such as alcohol, cannabis, cocaine, methamphetamine, heroin, nicotine, ketamine, psilocybin, MDMA, and LSD, has been explored. Furthermore, potential mechanisms linking the two have also been examined. According to current research, all substances appear to have a deleterious effect on SB except for ketamine and psilocybin, which could potentially confer a protective effect. Further studies are needed to understand the relationship between MDMA, LSD, and suicide. [ABSTRACT FROM AUTHOR]

Key Clinical Message: Psilocybin shows promise as a treatment for CRPS, offering significant pain relief and functional improvement in a patient with refractory symptoms. This case highlights the need for further research into psilocybin's efficacy and optimal dosing for chronic pain management. [ABSTRACT FROM AUTHOR]