To update my earlier post. I'll never know. At least not from observing the guy i was talking about. We had planned a DMT trip after a two hour hike in the woods and he showed up 'drunk' on DXM. I say that because that's how he acted. Think I'll stay aDXM virgin myself, kinda left a bad taste in my mouth. He was being a jerk. Why would someone take a disassociative before a hike? (I know that's what it is because he told me so, over and over. Also how dumb i was for not knowing. ) sheesh.
As for potentiating the DMT, i don't know. The DMT seemed to straighten him up a little, but he was still being a jerk.