"You took too much, man. You took too much. Too much, too much."
-Dr. Gonzo, Fear and Loathing in Las Vegas
One of the most famous drugs that pretty much nobody's ever done. The long form of its name is 3-hydroxy-1-methyl-5,6-indoline-dione. Not as, Dr. Thompson might have you believe, only available from the pineal glands of a living human being, it's actually, as CentrX already pointed out, just oxidized epinephrine. I once knew a guy who claimed he could synthesize adrenochrome from the drugs in asthma inhalers. For all I know, he was right and he's pulled it off by now. It's equally possible he's blown himself up or is in prison by now, but I still admire his pluck.
Most people that have studied the effects of adrenochrome consider it a psychotomimetic rather than a proper psychedelic. Although a similarity between its action and that of mescaline has been postulated by some who have studied, most consider the effects of adrenochrome to be much closer to that of out-and-out schizophrenia. In fact, some neurochemists studying schizophrenia believe that one of the possible causes may be the body releasing too much of its natural supply of adrenochrome. | 
