Dimethyltryptamine

[Monty]

DMT, a psychedelic [tryptamine], similar in structure to the neurotransmitter serotonin. The [maximal] effects last for a short period of time (5 - 30 minutes ), but it is considered to be the most powerful halucinogenic drug.
DMT experiences can include profound time-dilation, visual and audio hallucinations, and other experiences that, by most first hand accounts, defy verbal or visual description. Many accounts talk about perceiving other dimensions and traveling to the [end of the universe].