Psychoactives

Previous studies have shown that cannabis consumers are willing to pay more money for higher-quality products; however, the definition of “quality” cannabis has not been defined. Despite the known health risks of THC overuse, THC potency has been adopted as the primary market-driving feature of cannabis products. The purpose of this study was to objectively identify features of cannabis that contribute to its appealing subjective effects. In the course of conducting cannabis competitions, commercially available cannabis inflorescences were distributed to healthy volunteers (“judges”) in a randomized, double-blind fashion. Anonymous online survey data about the subjective effects of each cannabis sample were analyzed independently, by researchers not involved with the competitions. Pleasant subjective aroma (but not terpene expression, THC potency, or THC dose) was positively correlated with pleasant subjective effects. There was also a moderate but significant negative association between the amount of cannabis consumed and subjective appeal. These results suggest that, unlike THC potency, pleasant aroma is predictive of pleasant subjective effects. Similar to other agricultural commodities such as coffee and tea, aroma appears to be a robust indicator of the quality of cannabis inflorescence. These findings have wide-reaching public health implications, given the well-established health risks of THC overuse. Full article

Exposure to psychoactive substances is undoubtedly a serious public health issue that should be carefully analyzed from different perspectives. Regarding the types of toxic effects inflicted by these xenobiotics, it is already known that many of the common abused psychoactives have shown positive genotoxicity findings in complementary genetic toxicology assays. Nevertheless, while there are several experimental articles and reviews on this topic, it is also clear that additional information, particularly mechanistic studies, is still needed. This article addresses these issues, pointing out some aspects of the potential genotoxicity of psychoactive substances that should be further explored, and suggests some possible approaches that could be valuable in future toxicological studies. Full article

Alcohol use disorder (AUD) represents major public and socioeconomic issues. Alcohol exerts its pharmacological effects by altering different neurotransmitter systems, such as g-aminobutyric acid (GABA), glutamate, opioids, etc. Recent evidence suggests that the dynorphin (DYN)/kappa opioid receptor (KOR) system mediates the negative affective states associated with alcohol withdrawal. This system is also involved in stress-mediated alcohol intake in alcohol-dependent subjects. The DYN/KOR system probably exerts its action in the central nucleus of the amygdala (CeA) to mediate the negative affective states associated with alcohol withdrawal. This article aims to review the current literature regarding the role of the DYN/KOR system in the actions of alcohol. We first review the literature regarding the effect of alcohol on the level of the peptide and its receptor, and the role of the endogenous DYN/KOR system in alcohol reward and negative affective states associated with alcohol withdrawal is then discussed. We also review the literature regarding the effects of KOR ligands on these processes. Full article

Purpose: Survivors of pediatric brain tumor experience substantial post-treatment challenges, facing greater cognitive impairment and lower Health-Related Quality of Life (HRQoL) compared to survivors of other childhood cancers. Early studies report methylphenidate to benefit cognition and HRQoL in paediatric survivors of cancer via improved processing speed and attention. Parental opinion is an important element of treatment decision making, however parents’ views on methylphenidate treatment have not been reported. This study explored parental perceptions of their child’s treatment with methylphenidate. Materials and methods: An evaluation of 10 parents of children with previous brain tumour receiving methylphenidate was performed. Data were gathered by qualitative parental-report HRQoL questionnaire (PedsQL parent form) and by a questionnaire developed for use in this population. Results: Preliminary data suggest that parents are positive about the use of methylphenidate as an interventional measure, and believed this to have a beneficial impact on their child’s HRQoL. Conclusion: Early data from a small sample of parents suggest that methylphenidate may be effective in supporting HRQoL within this population. Parental information supports an increasing evidence base for the benefits of methylphenidate as an intervention for the management of long-term difficulties associated with paediatric cancer. Full article

The COVID-19 pandemic has made evident the need to develop effective strategies to cushion the psychological consequences of social catastrophes. Preliminary evidence suggests that the use of hallucinogens is a protective factor that mitigates against such stressors. However, the underlying mechanisms must be further explored. This study specifically focused on the potential role of coping strategies in this regard, analyzing them through an online survey completed by a total of 2971 subjects who were followed up with from the beginning of the COVID-19 pandemic until six months after baseline. The survey was published in three different cultures (English, Spanish, and Portuguese), allowing for the collection of data from three different cultural contexts. The results show that coping strategies were generally more related to psychological well-being and psychopathology than to hallucinogenic drug use. However, regarding the latter, users of hallucinogens had higher scores on problem-focused engagement and disengagement and lower scores on wishful thinking than non-users. Longitudinally, while most baseline coping scores were associated with psychological distress and the severity of psychological symptoms, some coping strategies were related to the use of hallucinogens. These results show an adaptive pattern of coping strategies among hallucinogen users. Further research should take into account that coping strategies are only marginally associated with hallucinogenic drug use. Other underlying mechanisms explaining the better adjustment of users of hallucinogens to pandemics should be explored. Full article

This technical clinical and forensic note is designed to interpret the influence that psychoactive (or psychotropic) substances may have on driving. The present interpretation is restricted to the four groups of substances (i.e., cannabinoids, cocaine and metabolites, opiates and amphetamines and derivatives) outlined in Annex V of Ordinance No. 902-B/2007 of 13 August and it is expected that can be extrapolated to other jurisdictions besides Portugal. This work is presented in a pragmatic and objective way, avoiding the clinical, physiological, pathophysiological, and toxicological aspects that would hinder understanding and impair the usefulness and applicability of its content. The evaluation of the state of influence by psychotropic substances is a complex clinical and forensic subject especially due interindividual variability and concomitant consumption of other substances that may predispose to pharmacological interactions. Full article