Methylenedioxymethamphetamine (MDMA) is better known as ecstasy, the club drug of choice at raves, bars, and dance scenes. But what is it, and what does it do? Users and doctors discuss its history, its effects on the body and brain, and the psychological damage it can cause. Ecstasy may not be physically addictive, but the search for the sense of well-being and euphoria that it initially produces can be. Concludes with how and where to get help. Some scientific explanations given.