Mdma (3-4 methylenedioxymethamphetamine) is a synthetic, psychoactive drug with a chemical structure similar to the stimulant methamphetamine and the hallucinogen mescaline.It commonly …Mdma has become widely known as ecstasy (shortened e, x, or xtc), usually referring to its tablet form, although this term may also include the presence of possible adulterants or diluents.Ecstasy/mdma acts as both a stimulant and hallucinogen, producing an energizing effect, distortions in time and perception, and enhanced enjoyment of tactile experiences.