This year, the drug MDMA, otherwise known as ecstasy, could take a step toward medical respectability.

Ecstasy gained notoriety as a party drug in the 1980s and 1990s. (Recall teenagers at raves with sparkly eyes and pacifiers rolling and dancing all night; a revival appears to be under way in England.) Enthusiasts say the drug makes them feel relaxed, energetic, and mentally clear. One likened it to a six-hour orgasm. In rare cases, however, users died after dancing for hours and overheating, or after taking mixtures of ecstasy and other drugs. Animal studies have shown that long-term, heavy ecstasy use can be risky for the brain. Human studies have found some ill effects in chronic users, as well. The government classifies MDMA (or 3,4-methylenedioxymethamphetamine) along with heroin, LSD, and marijuana as a Schedule 1 drug, which means that it's illegal and has no recognized medical uses.

But research has not proved that moderate or low doses of ecstasy are particularly dangerous. And avant-garde psychiatrists have long argued that in a controlled clinical setting, low amounts can play a role by reducing fear, without sedation, and so encourage openness and emotional insight. "There is nothing else like this in psychiatry—a fast-acting anti-anxiety medication that makes people alert and talkative," says Julie Holland, a psychiatrist at NYU Medical Center. If available to treat patients, "It would be incredibly useful."

Some mental-health professionals interested in exploring MDMA's therapeutic uses protested when the government made it illegal 20 years ago. Stories of the drug's power to combat the psychological effects of terminal illness have continued to surface over the years. But proponents have had little but anecdote to go on. The current wave of studies should bring new rigor to answering an old question: whether MDMA deserves to be a prescription drug.