The Global Drug Survey 2020 is a large online survey on drug use collected between November 2019 and February 2020.

Positive changes were observed across all 17 outcome items, with the strongest benefits on items related to insight and mood. Negative effects were reported by 22.5% of respondents.

High intensity of psychedelic experience, seeking advice before treatment, treating with psilocybin mushrooms and treating post-traumatic stress disorder were associated with higher scores on the self-treatment outcome scale after averaging values across all 17 items.

Younger age, high intensity of experience and treating with LSD were associated with increased number of negative outcomes.