RT Journal Article SR Electronic T1 First study of safety and tolerability of 3,4-methylenedioxymethamphetamine (MDMA)-assisted psychotherapy in patients with alcohol use disorder: preliminary data on the first four participants JF BMJ Case Reports JO BMJ Case Reports FD BMJ Publishing Group Ltd SP e230109 DO 10.1136/bcr-2019-230109 VO 12 IS 7 A1 Sessa, Ben A1 Sakal, Chloe A1 O’Brien, Steve A1 Nutt, David YR 2019 UL http://casereports.bmj.com/content/12/7/e230109.abstract AB We present the preliminary data in an ongoing open-label safety and tolerability proof of concept study exploring the potential role for 3,4-methylenedioxymethamphetamine (MDMA)-assisted psychotherapy in treating patients with alcohol use disorder. At this stage, seven participants have completed the full 8-week MDMA-assisted psychotherapy course, including two therapy sessions each with MDMA. This paper focuses on the safety and tolerability of the therapeutic course for the first four participants to complete treatment. Longer-term outcomes of drinking behaviour will be presented later when the full project data are published. Results show all four participants have successfully tolerated the treatment. There have been no serious adverse events related to MDMA, no unexpected physiological responses to the MDMA sessions or changes to blood results or electrocardiograms, measured before and after the 8-week course. We conclude that the treatment is well- tolerated and are making plans to expand the project into a randomised placebo-controlled study.