I feel like less is more with IVing but only to a certain extent! If I slam anything less than 1mg of bupe, I don't feel shit, I mean I feel "better" and well, not sick or anything... but if I do like 2mg a shot, I feel fucking perfect, at least with just straight buprenorphine(subutex). I do these 2mg shots usually 3-4x a day, doing in total around a whole 8mg tablet, every 3-5 hours or so.. or when I feel the effects start to wear off.. This is just my experience with IV subs, I have also had success shooting suboxone, and zubsolv, but as far as suboxone goes, the only ones I liked were the white half-moon tabs, not the brand name strips... fuck that, those are wayyy worse (so I have heard) for you than shooting the tabs, and I know the naloxone in suboxone and zubsolv supposed to be completely ineffective, and for the most part it is, but I still like the feeling I get from subutex, more than any buprenorphine/naloxone pills that I have shot, and no it is not in my head, I have literally more than a few times done a shot of suboxone and then a shot of subutex in one day, and the feeling I got from the 'tex, was much stronger and sedating feeling, the suboxone had more of an energetic feel to it, and wasn't as strong feeling to me. Lots of people like to do microgram doses with bupe, however, I have never once been happy doing microgram shots, like less than 0.2-0.5mg of sub... I get literally nothing, feels like I shot water alone. 2mg of 'tex, for the first 30 mins or so after being shot, has me feeling GREAT! I mean as far as bupe goes... I actually sometimes feel as if I am on a full agonist, will catch a slight nod, and be all nice and relaxed, while laying on my bed, eyes feeling like they are glued shut for the first 10mins after the shot.. its amazing, how good bupe can actually feel.. some don't get anything from bupe, just well and not dopesick any more.. I actually get high from bupe, when IVed. I don't feel any different, if anything not as good, from shots over 4mg at a time though... which is why I said less is more, to an extent. But everyone reacts very different to bupe.. some love the feeling of a good shot or however you take it... some hate it and some just take it to feel normal, not high, but not sick and get nothing more.