Ethcathinone is a stimulant drug in the chemical groups of phenethylamine, amphetamine, and cathinone, also known as ethylpropion or E-CAT. It is an active diethylcathinone prodrug metabolite and is entirely responsible for its effects. Ethcathinone has been identified as an ingredient in both quasi-legal “party drugs” and has also been confirmed to have been marketed in the Australian city of Cairns as “ecstasy” along with mephedrone.