honestly, i think the naloxone prevents you from feeling the initial rush from bupe when you inject it as when you IV subutex you feel that blanket and subtle rush within seconds or a min later, when IVing suboxone i noticed i dont get that rush like i do with subutex, i just notice the bupe buzz 30mins later without a rush..in my experience, it seems naloxone just puts a blanket over the buzz bupe gives u to a degree when IVed