Ecstasy test. Branded ecstasy pills lined up next to test tubes ready for forensic analysis. This is required to find the exact composition of the pills, since the composition and purity can vary enormously. Ecstasy pills usually contain MDMA (an amphetamine), but can contain other amphetamines, such as MDEA. Impurities increase the risks involved in taking the drug. The exact composition can also help to identify the source of the drugs, and help link a suspected dealer to the drugs. Ecstasy is a drug taken for its stimulant effects. It is illegal in many countries.