Pain killer...
Is is a pain killer. A synthetic opiod. This is a broad statement, but I would say its anagolous to Nubain. I feel its slighty stronger and is more of a head buzz, while Nubain is more of a body - limp, warmth kinda buzz.
It is addictive just like like all other opiates. Its acts as an agonist/antagonist to various opiod receptors (like Nubain). I would stay away from it if I were you. There are a lot of "bain heads" out there who are switching to Butorphanol b/c it is cheaper and more readily available. You can't play with opiods long b/f you become hooked, its both a physical and phsycological addiction.
The human brand ame is called Stadol, commonly used for severe migraines.
If you have legit pain, the stuff works great. After I shot T400 once into my quads I couldn't walk the day after. 2mgs of Bute and my leg felt fine.
If you really need the stuff for true pain drop me line. If you want it to get a buzz (i'm not your mother), but i recommend you stay away.