The party drug known as Molly has been all the rage in popular music recently, but chemists might know it better from its chemical name: methylenedioxy-methylamphetamine or MDMA. MDMA (you may know it as ecstasy if you partied super hard in the 90s). What you might not know about MDMA is that it seems to be an extremely effective way to help treat PTSD. On Tuesday, the FDA gave approval for a Phase III trial, based off previous studies like one that showed two-thirds of patients treated no longer fit the criteria for having PTSD. The researchers have applied for Breakthrough Therapy Designation, and if they succeed, we could see a branded MDMA drug on the market by 2021.