DXM, also known as dextromethorphan has been widely used to suppress coughs. I am sure we all have tried it at one time in our lives.
Upon reading it is the black sheep of the psychedelic family. It is said to be the bottom of the barrel, but others argue and say it has shamanic powers.
It was commonly used by those we know - Allen Ginsberg and Jack Kerouac. One must not forget that it is a synthetic opioid analog. At the lower doses it is a stimulant with euphoric episodes and at higher doses can act as a dissociative anesthetic.
Some feel as Dr Peter Addy from Yale that DXM is one of the few chemicals NOT under prohibition that facilitates access to transpersonal experience.