In the 1950s and 60s, mental health providers used psychedelics to help patients open up about difficult memories. Then, the drugs were banned. Now there’s a resurgence. Psychedelics like MDMA, psilocybin, and ketamine are being studied as solutions for anxiety, depression, and PTSD. Findings show that drugs like MDMA are especially useful in the context of healing from trauma. Rachel Yehuda, director of the Center for Psychedelic Psychotherapy and Trauma Research, and Gita Vaid, a psychologist and psychoanalyst who researches ketamine assisted psychotherapy, discuss psychedelic therapies with Alison Snyder of Axios.