The FDA said there wasn't enough data showing the drugs helped patients and asked for another clinical trial.

The US has denied a bid to allow MDMA, commonly known as ecstasy or molly, to be used in the treatment for post-traumatic stress disorder (PTSD).

The US Food and Drug Administration (FDA) was examining the psychedelic drug made by Lykos Therapeutics to treat the mental health disorder in combination with talk therapy.