don't waste it IM. either iv or rectal otherwise a waste.
I totally get where you're coming from man. I would probably say the same thing. It's a little different for me, as I started doing intramuscular shots about a year and a half before I stopped injecting, so I got comfortable with it over time. The "rush" from IV injection was always just a cool bonus to being high for 4-6 hours. It was never the primary goal. I know a lot of people who IV everything, Methamphetamine, Fentanyl, everything and they say the same thing. It's all a waste without the rush. Even my buddy who will be high for 12 hours after a shot of Meth will claim it's a waste without the rush.
Just try to examine this situation from the lens of someone who is doesn't have a tolerance or significant experience with this stuff. I'll clarify what I mean when I claimed that an IV shot would be a kind of "waste" for someone without experience. Hydromorphone (Dilaudid) is arguably the most powerful rush offered by any of the commonly available Opioids available, Fentanyl included. My best friend, to this day, and I lived together during college and neither of us really ever played video games that much. He brought home an original Playstation from a yardsale one day and we played Gretzky for like 12 hours straight. This was around 2008-2009 and there was, I believe, at least a Playstation 3 going at that point.
The point is, if we have just gotten a Playstation 3, we never would've had nearly as much fun as playing that original Playstation. We would need the better graphics, the different games. Our naivete regarding video games allowed us to have a ton of fun, for cheap and if we got tired of that playstation, we could always get a playstation 2 down the road and have fun with that.
Not to mention, as we know that a faster, stronger hit is known to produce a relatively stronger level of psychological reinforcement, it's safe to say that you are increasing someone's likelihood for later addiction to drugs. I say, the intramuscular route is perfect. I would even recommend the rectal route prior to moving up to any injection ROA, but the ball is in the court of OP in this situation.