It’s an old drug with a new name, NBCNews.com reports. The drug, known as “Molly,” is the powder or crystal form of MDMA, according to the Drug Enforcement Administration. MDMA is the pure form of an ingredient usually found in Ecstasy.

ABC News reports that Molly was to blame for the deaths of two young people at a New York City dance festival, known as Electric Zoo, over the weekend. In fact, officials were forced to end the event early due to concerns about drug use and the potential for more deaths or health issues among the concertgoers.

“The Department of Health did not want to see a re-occurrence,” said New York City Police Commissioner Ray Kelly.

According to police, 20-year-old Olivia Rotondo and 23-year-old Jeffery Russ died after using Molly.

According to the Drug Policy Alliance, Molly’s effects are similar to those of both stimulants and psychedelics. One-hundred to 125 mg of Molly, which is considered a typical dose, lasts four to six hours.

The Drug Policy Alliance adds that people who take Molly characterize themselves as feeling open, accepting, unafraid and linked to the people around them. The drug is typically taken in social settings, like concerts and clubs, because the drug’s effects are excited by visuals, sounds, smells and touch.

There are some serious side effects associated with the use of Molly. According to the Drug Policy Alliance, an alarmingly high increase in body temperature, known as hyperthermia, is linked to ecstasy. This type of reaction typically results from dancing in a hot environment without consuming liquids.

“It raises your body temperature, your heart rate goes up, your blood pressure goes up, and so it does make you more prone to heat stroke,” crime analyst Brad Garrett said, according to ABC News.

Citing the Drug Abuse Warning Network, CBS News reports that more than 22,000 people visited hospital emergency rooms for Ecstasy-related issues in 2011.

Sadly, this is the third Molly-related death in less than a week.  A concertgoer died in Boston last week at a Zedd concert.

Why is an old drug so popular again or has it always been popular under different names? Share your thoughts in the comments section.