MDMA-assisted psychotherapy can be an effective treatment for people who do not respond to traditional therapies for PTSD.
https://www.youtube.com/watch?v=t-4L5vRZ_g8 < three minute rundown that explains MDMA
https://www.youtube.com/watch?v=BNxuRs6tTuw < The Verge / Ecstatic states: treating PTSD with MDMA