3,4-methylenedioxy-methamphetamine (MDMA), also known as ecstasy or Molly, is a synthetic drug that acts as both a stimulant and hallucinogen. It was first used in psychotherapy in the 1970s but became illegal in 1985. MDMA increases levels of dopamine, norepinephrine, and serotonin in the brain, causing feelings of increased energy and pleasure. While some research has indicated MDMA may help treat conditions like PTSD, its use also poses neurological, physical, and mental health risks. National surveys find around 12% of Americans ages 18-25 have used MDMA, though less than 1% report using it in the past year.