![]() ![]() ![]() MDMA did not induce adverse events of abuse potential, suicidality or QT prolongation. The mean change in CAPS-5 scores in participants completing treatment was −24.4 (s.d. MDMA was found to induce significant and robust attenuation in CAPS-5 score compared with placebo ( P < 0.0001, d = 0.91) and to significantly decrease the SDS total score ( P = 0.0116, d = 0.43). Adverse events and suicidality were tracked throughout the study. ![]() PTSD symptoms, measured with the Clinician-Administered PTSD Scale for DSM-5 (CAPS-5, the primary endpoint), and functional impairment, measured with the Sheehan Disability Scale (SDS, the secondary endpoint) were assessed at baseline and at 2 months after the last experimental session. After psychiatric medication washout, participants ( n = 90) were randomized 1:1 to receive manualized therapy with MDMA or with placebo, combined with three preparatory and nine integrative therapy sessions. We report the findings of a randomized, double-blind, placebo-controlled, multi-site phase 3 clinical trial (NCT03537014) to test the efficacy and safety of 3,4-methylenedioxymethamphetamine (MDMA)-assisted therapy for the treatment of patients with severe PTSD, including those with common comorbidities such as dissociation, depression, a history of alcohol and substance use disorders, and childhood trauma. Post-traumatic stress disorder (PTSD) presents a major public health problem for which currently available treatments are modestly effective. Nature Medicine volume 27, pages 1025–1033 ( 2021) Cite this article
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