Comorbidity also implies that the illnesses interact affecting the course and prognosis of both. The study will be sponsored by the Multidisciplinary Association for Psychedelic. Pdf Mdma Assisted Psychotherapy For People Diagnosed With Treatment Resistant Ptsd What It Is And What It Isn T When two disorders or illnesses occur in the same person simultaneously or sequentially they are described as comorbid. . It also expects to initiate a clinical trial of a methylenedioxymethamphetamine MDMA therapy in treating PTSD. This research report provides information on the state of the science in the comorbidity of substance use disorders with mental illness and physical health.