[ecstasy], [speed], [ephedrine], [caffeine]  taking more than the recommended dosage will cause side effects typical of ats drugs
ampthetamine type stimulants  includes [methamphetamine] [cogeners] and a number of its methylenedioxy derivatives
"[ecstasy], [speed], [ephedrine], [caffeine]  taking more than the recommended dosage will cause side effects typical of ats drugs" What is the definition of "ats"?