In this survey we investigate the subacute effects of psychedelic substances. Data collection has been completed in the end of february 2021. Thank you for your participation!

What it is about

Effects of psychoactive substances that occur after the acute effects of the substance have subsided
Afterglow Survey

The Afterglow-Survey is conducted by the Psychotropic Substances Research Group of the Charité Universitätsmedizin Berlin. The aim of the study is to investigate the effects of psychoactive substances that occur after the acute effects of the substance have subsided. The intake of psychoactive substances such as LSD, psilocybin, cocaine or amphetamine has various effects on consciousness. A distinction can be made between the immediate effects of the substances and the effects that first occur in the days following substance use. In the Afterglow-Survey we investigate which effects on the mood and subjective experiences occur in the days after the intake of psychoactive substances. We would like to find out how after-effects differ between the substances.

  • Participation in the survey is completely anonymous and no IP address will be saved. It is therefore not possible for us to trace back who completed the questionnaire.


The survey is carried out by

Dr. med. Tomislav Majic

is a psychiatrist, psychotherapist, and head of the research group Psychotropic Substances at the Psychiatric University Clinic Charité at St. Hedwig hospital in Berlin. He is also head of the outpatient and day clinic for people suffering from double diagnoses and head of the outpatient clinic for psychoactive substances, where people are treated for mental health problems or problems with integrating difficult experiences occurring after the use of psychedelics or other substances.

Dr. Timo Torsten Schmidt

is a neuroscientist working at the Freie Universität Berlin. He is interested in the neuronal mechanisms of altered states of consciousness. He is running the Altered States Database: His professional website is

Dr. Ricarda Evens

is a psychologist and psychotherapist and member of the psychotropic substances working group at the Department of Psychiatry at Charité in St. Hedwig-Krankenhaus, Berlin. Her research focuses on potential benefits of substance-assisted psychotherapy.

Dr. med. Peter Gasser

is a specialist for psychiatry and psychotherapy, FMH. Established in his own practice in Solothurn Switzerland. President of the Swiss Medical Society for Psycholytic Therapy (SÄPT), many years of experience with the use of psychedelics and entactogens in psychotherapy. Head of the first study on the therapeutic use of LSD after over 40 years of research interruption
We would like to thank Peter Gasser for his support with this study!

Dr. William A. Richards, PhD

is a psychologist at the Hopkins Center for Psychedelic and Consciousness Research, with formal training in theology and comparative religion, has conducted psychedelic research at the Johns Hopkins School of Medicine for the past two decades. From 1967-1977, he also implemented clinical research in psychedelic therapy in the U.S. He is author of the recent book “Sacred Knowledge”.
We would like to thank William A Richards for his support with this study!