adam, n.² — Green’s Dictionary of Slang

adam n.²

[the initial letters + ref. to the primal intensity of the drug experience]

MDMA.

1987		J. Stevens Storming Heaven (1988) 359: LSD [...] has been superseded by a new generation of psychedelics with names like Ecstasy, Adam, Intellex, 2CB, Vitamin K and a handful of others.
2001		ONDCP Street Terms 1: Adam — Methylenedioxymethamphetamine (MDMA).
2002		London NHS Trust Community Drug Service ‘The Facts About Ecstasy’ In the Limelight 🌐 What is ecstasy? [...] It is also called E, XTC, Adam, Love Doves, New Yorkers, M25’s, Disco Burgers, Dennis The Menace to name a few.