party monster is about all sorts of drugs but it focuses on the "club kids" from the early 90's, there was a lot of ecstasy and ketamine usage going on.
Holy Rollers is a fairly recent film- more about the selling and transport of MDMA, rather than doing it. I'd love a great, accurate move to be made about MDMA. I saw most of the portions of "Rolling" and it was poorly acted and shot like an after-school special.