Inclusion Criteria:  Enrolled in a MAPS-sponsored study of MDMA-assisted therapy for the treatment of PTSD Have received Investigational Medicinal Product (IMP) in at least one Experimental Session in the main study Agree to be contacted by study team at least six months after the last Experimental Session in the main study to schedule and participate in LTFU visits  Exclusion Criteria:  Are not able to give adequate informed consent Have any current problem which, in the opinion of the investigator or Medical Monitor, might interfere with participation