I know MDMA is certainly useful in treating PTSD, after just a few sessions! That's way way more effective than any other treatment. It works because every time a PTSD victim retells or even thinks about their trauma, it retraumatizes them, When they are on MDMA, they can retell their trauma story without the retraumatization, just because MDMA is so euphoric. I would not be surprised if psilocybin works the same way.
