MDMA (what's ecstasy?) could get approval but it could also result in people getting addicted to it. Doesn't take a lot of searching to find stories of people who damage their brains after prolonged usage. I'm sure MDMA has its benefits, but there's probably other risks involved in prescribing it in a healthcare setting. Benzodiazepines were routinely given out by doctors, but probably worsened overall anxiety in a lot of patients. Now they are rarely prescribed.