Ecstasy, chemically known as MDMA, is made in illicit labs with chemicals and processes that vary from lab to lab. What is sold as ecstasy often contains unknown drugs, fillers or drugs other than MDMA, which may or may not have similar effects (such as caffeine, ephedrine, amphetamine, dextromethorphan, ketamine, or LSD). Ecstasy sometimes contains highly toxic drugs, such as PMA (paramethoxyamphetamine), which can be lethal even in low doses.