Addiction (Abingdon, England)
2025
Leigh Coney, Amy Peacock, Daan van der Gouwe et al.
8 citations
Drugs sold on cryptomarkets are thought to have lower levels of adulteration and higher strength compared with those sourced off-line. The present study aimed to determine whether cryptomarket and off-line-sourced 3,4-methylenedioxy-N-methamphetamine (MDMA), cocaine, amphetamine, methamphetamine and lysergic acid diethylamide (LSD) differed in adulteration and strength. A between-groups design...
Current Topics in Behavioral Neurosciences
2025
Tim Hirschfeld, Felix Blei, Lavinia Stegemann et al.
1 citation
Classic psychedelics such as LSD, psilocybin, and DMT from unregulated markets pose considerable risks through unknown adulterants and potencies. In this chapter, we explore the importance of drug checking in minimizing harm among users of classic psychedelics and examine the opportunities and challenges associated with intervention settings, analytical techniques, and risk communication...
European Addiction Research
2021
Matthijs Blankers, Daan van der Gouwe, Lavinia Stegemann et al.
21 citations
In this article, we present an evaluation of online psychoactive substance trade via Telegram, a free encrypted social media messenger service. The evaluation took place during the COVID-19 pandemic, which allowed us to monitor the effects of the spring 2020 lockdown in the Netherlands on substance trade via Telegram. The objective of this study was to evaluate whether changes in psychoactive...
2021
Daan van der Gouwe, Tim Hirschfeld, Tomislav Majić et al.
Purpose of Review With the continuous emergence of new psychoactive substances, drug checking (DC) services are challenged by an increasingly complex drug market. Considering the resumed scientific and public interest in serotonergic psychedelics (SPs) like LSD, psilocybin, and 2C-B, we present the results of a literature search investigating the presence and proportion of SPs in DC samples....
March 4, 2018
Vendula Belackova, Martin Pažitný, Eva Drapalova et al.
Aims: The indicator of availability has been used in the risk assessment (RA) of new psychoactive substances (NPS). This paper aims to examine the pre- and post-control availability of 25I-NBOMe, AH-7921, MDPV and MXE, which were assessed by the EMCDDA. Methods: Data were collected by a semi-automated software tool (I-TREND SASF) on e-shops in national languages (Czech, French, Dutch, Polish...
Addiction (Abingdon, England)
April 1, 2017
Daan van der Gouwe, Tibor M Brunt, Margriet Van Laar et al.
72 citations
On-line drug markets flourish and consumers have high expectations of on-line quality and drug value. The aim of this study was to (i) describe on-line drug purchases and (ii) compare on-line with off-line purchased drugs regarding purity, adulteration and price. Comparison of laboratory analyses of 32 663 drug consumer samples (stimulants and hallucinogens) purchased between January 2013 and...
Drug and Alcohol Dependence
February 1, 2015
Laura Hondebrink, Johanna J Nugteren-Van Lonkhuyzen, Daan van der Gouwe et al.
119 citations
In recent years, the number of new psychoactive substances (NPS) appearing on the illicit drug market strongly increased. However, little is known about their toxic effects and risks. Therefore, we determined the most frequently occurring NPS in The Netherlands and combined this with data regarding drug-related intoxications. Data from the Drugs Information and Monitoring System (DIMS) and the...