What did shooting suboxone feel like?
It all depends.
If you are already taking suboxone at high dosages (8mg and up), than you will not get anything from injecting your suboxone. However, if you are not on suboxone maintenance, or if you are but on a low dose (4mg and under), you
can shoot your suboxone and get some type of effect out of it that is actually noticeable.
For me, IV suboxone was really only worthwhile when I had tapered myself down to 4mg sublingually and then started to IV .5mg shots 2x/day. At that point it was basically not very different from sniffing or taking it sublingually, only it hit me faster (you feel part of it immediately, but it peaks really in around 2-5 minutes). However, once I got down to doing .1-.2mg (or 1-200microgram) shots, I felt a lot more euphoria from it, and I even got that dope taste in my mouth after an injection. I wouldn't say Bupe gives an intense rush, but there is a rush there, its just takes a little longer to hit than other opiates. All in all, I think plugging suboxone/Subutex is vastly superior as it gives the same clean effect, but it lasts twice as long (as long as sublingual).
Also, the reason that people IV such small doses of suboxone (or rather, why they
should) is because IV is so much stronger than nearly every other ROA (by at least 50%, and its 70% stronger than SL) asides from intramuscular injections (which I wouldn't recomend). So injecting .5mg is like taking 2mg sublingual, and injecting 2mg is like taking 6-8mg sublingually. There are other factors at place that make it hard to really give you an exact equipotent dose when switching from SL to IV (
such as duration-IV Bupe has a much shorter duration than sublingual administration, as intravenous infusions of buprenorphine result in the drug reaching its peak plasma concentrations nearly immediately, and therefor your body begins to metabolize the drug immediately as well. With sublingual administration,oral, or insufflation, it can take up to 90 minutes or longer to reach this peak state, making the duration significantly longer), but when it comes down to it, the BA for the different Routes of Administration of Buprenorphine listed here on Bluelight are correct.
Seriously though, if you're thinking about injecting your suboxone, don't, plug it instead, I guarantee you will enjoy it more.