According to the National Institute of Drug Abuse (NIDA), Molly, or MDMA (3,4-methylenedioxy-methamphetamine), popularly known as ecstasy, is a synthetic, psychoactive club drug that has similarities to both the stimulant amphetamine and the hallucinogen mescaline. It produces feelings of increased energy, euphoria, emotional warmth and empathy toward others, and distortions in sensory and time perception.
Here's what NIDA blogger "Sara Bellum" has to say about Molly:
Molly Is Often Mixed Up. MDMA is a synthetic drug, meaning that it’s made of chemicals. It comes in colorful pills, tablets, or capsules that sometimes have cartoon-like images on them. Sometimes each pill, or batch of pills, can have different combinations of substances in the mix and cause unknown consequences.
Molly Makes You Hyper. People who use MDMA might feel very alert, or “hyper.” But MDMA can also cause muscle cramping, nausea, blurred vision, increased heart rate and blood pressure—and in rare cases, hyperthermia and even death.
Molly Can Depress You. Potential side effects of MDMA include feelings of sadness, anxiety, depression, and memory difficulties. These can last for several days to a week (or longer in people who use it regularly).
Molly Is Dangerous. MDMA can be extremely dangerous in high doses—increasing the risk of seizures and compromising the heart's ability to maintain its normal rhythms. A study in animals showed that exposure to high doses of MDMA for 4 days produced brain damage that could still be seen 6 to 7 years later.
Ecstasy and MDMA Use Is Rising. Despite these harmful consequences, NIDA’s Monitoring the Future study shows that past-year Ecstasy use is up significantly among college students and young adults age 19–28. Another report shows that emergency room visits related to Ecstasy increased nearly 123% from 2004 to 2009; two-thirds of these visits involved 18–29 year olds. This is troubling news, since we’re still learning how Ecstasy affects the brain.