AD	anxiety disorders
BBB	blood–brain barrier
BDNF CTIS	brain-derived neurotrophic factor Clinical Trials Information System
CTA	Clinical Trial Application
DMN	Default Mode Network
DMT	N,N-Dimethyltryptamine
EMA	European Medicines Agency
EU	European Union
EU CTR	EU Clinical Trials Register
EUDA	European Union Drugs Agency
FDA	Food and Drug Administration
IRB	Institutional Review Board
LSD	lysergic acid diethylamide
MAPS	Multidisciplinary Association for Psychedelic Studies
MD	major depression
MDMA	3,4-methylenedioxy-N-methylamphetamine
OCD	obsessive-compulsive disorders
PAREA	Psychedelics Access and Research European Alliance
PTSD	post-traumatic stress disorder
RDD	recurrent depressive disorder
TRD	treatment-resistant major depression
USA/US	United States of America
WHO	World Health Organisation