MDMA-assisted psychotherapy for treatment of PTSD study design and rationale for phase 3 trials based on pooled analysis of six phase 2 randomized controlled trials.
Posttraumatic stress disorder is a prevalent mental health condition with substantial impact on daily functioning that lacks sufficient treatment options. Here we evaluate six phase 2 trials in a pooled analysis to determine the study design for phase 3 trials of MDMA-assisted psychotherapy for PTSD. Six randomized, double-blind, controlled clinical trials at five study sites were conducted from April 2004 to February 2017. Active doses of MDMA (75-125 mg, n 72) or placebocontrol doses (0-40 mg, n 31) were administered to individuals with PTSD during manualized psychotherapy sessions in two or three 8-h sessions spaced a month apart. Three non-drug 90-min therapy sessions preceded the first MDMA exposure, and three to four followed each experimental session. After two blinded experimental sessions, the active group had significantly greater reductions in CAPS-IV total scores from baseline than the control group MMRM estimated mean difference (SE) between groups - 22.0 (5.17), P < 0.001. The between-group Cohens d effect size was 0.8, indicating a large treatment effect. After two experimental sessions, more participants in the active group (54.2%) did not meet CAPS-IV PTSD diagnostic criteria than the control group (22.6%). Depression symptom improvement on the BDI-II was greatest for the active group compared to the control group, although only trended towards significant group differences MMRM, estimated mean difference (SE) between groups - 6.0 (3.03), P 0.053. All doses of MDMA were well tolerated, with some expected reactions occurring at greater frequency for the active MDMA group during experimental sessions and the 7 days following. MDMA-assisted psychotherapy was efficacious and well tolerated in a large sample of adults with PTSD. These studies supported expansion into phase 3 trials and led to FDA granting Breakthrough Therapy designation for this promising treatment. ClinicalTrials.gov Identifier NCT00090064, NCT00353938, NCT01958593, NCT01211405, NCT01689740, NCT01793610.