I'm aware that there's already a drug nicknamed "Soma;" however, if you ask me, MDMA is the soma Huxley was talking about.

ESPECIALLY with the news that the U.K. is experimenting with MDMA in patients with PTSD.

“There’s always soma to calm your anger, to reconcile you to your enemies, to make you patient and long-suffering. In the past you could only accomplish these things by making a great effort and after years of hard moral training. Now, you swallow two or three half-gramme tablets, and there you are. Anybody can be virtuous now. You can carry at least half your morality about in a bottle. Christianity without tears-that’s what soma is.”
-Aldous Huxley, Brave New World

(I’m not making an opinion on the use of MDMA to aid PTSD patients— I think everyone has a right to be happy. I’m merely drawing parallels. I think Huxley was far beyond his time.)