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1.
Subutex contains only Buprenorphine. (in contrast to the other definition).

Suboxone contains Buprenorphine and naloxone,witch ensures greater dificulty of achieving a "high".

However, it is very possible to get "high" off subutex. (Personal expirience).
"Herion withdrawls may be reduced with subutex."
by The Pharmacist January 08, 2006