Psychopharmacology
March 10, 2021
Malin V. Uthaug, Natasha L. Mason, Stefan W. Toennes et al.
116 citations
Abstract Ayahuasca is a plant concoction containing N,N -dimethyltryptamine (DMT) and certain β-carboline alkaloids from South America. Previous research in naturalistic settings has suggested that ingestion of ayahuasca can improve mental health and well-being; however, these studies were not placebo controlled and did not control for the possibility of expectation bias. This naturalistic...
Journal of Psychoactive Drugs
January 24, 2019
Kim P. C. Kuypers, E. B. de Sousa Fernandes Perna, Eef L. Theunissen et al.
13 citations
The phenethylamine 4-fluoroamphetamine (4-FA) is a so-called novel psychoactive substance with a chemical structure resembling that of amphetamine and MDMA. Since 4-FA users report their subjective experience ranges between the effects induced by amphetamine and MDMA, and it is known that both substances can produce an altered state of consciousness, this study tests whether 4-FA induces a...
Psychopharmacology
May 31, 2018
Kim P. C. Kuypers, E. B. de Sousa Fernandes Perna, Patrick C. Dolder et al.
14 citations
BACKGROUND: New psychoactive substances (NPS) are chemical analogues designed to mimic the effects of various classic recreational drugs of abuse including MDMA, LSD, and cannabis. NPS use is associated with concern about the acute and longer-term effects particular substances might have, with abuse and addiction as potential consequences. Impulsivity and sensitivity to the rewarding effects of...
Scientific Reports
January 12, 2018
Kim P. C. Kuypers, Rafael de la Torre, Magı́ Farré et al.
12 citations
Abstract MDMA exerts its main effects via the serotonergic system and the serotonin transporter. The gene coding for this transporter determines the expression rate of the transporter. Previously it was shown that healthy individuals with the short allelic variant (‘ s -group’) of the 5-HTTLPR-polymorphism displayed more anxiety and negative mood, and had a lower transcriptional efficiency...
British Journal of Pharmacology
November 22, 2017
Eef L. Theunissen, Nadia R. P. W. Hutten, Natasha L. Mason et al.
38 citations
BACKGROUND AND PURPOSE: Synthetic cannabinoids (often sold as Spice or K2) have become a very popular alternative to cannabis due to their easy access and portrayed safety. Controlled studies on the behavioural effects of synthetic cannabinoids are currently lacking, which hampers risk assessments of these compounds. EXPERIMENTAL APPROACH: This is a first attempt to assess the influence of a...