MDMA ("Ecstasy")
"MDMA (3,4-Methylenedioxymethamphetamine), commonly known as "Ecstasy", is a psychoactive drug and member of the amphetamine chemical class. It produces entactogenic, psychedelic, and stimulant effects.
MDMA is considered unusual for its tendency to induce a sense of intimacy with others and diminished feelings of fear and anxiety. These effects have led some to suggest it might have therapeutic benefits in certain individuals. Before it was made a controlled substance, MDMA was used as an augmentation to psychotherapy, often couples therapy, and to help treat clinical depression as well as anxiety disorders, the results of which are poorly documented. Studies have also recently been initiated to examine the therapeutic potential of MDMA for post-traumatic stress disorder (PTSD) and anxiety associated with terminal cancer."
Taken from Wikipedia (http://en.wikipedia.org/wiki/MDMA)