I don't personally IV myself, so excuse me for my ignorance.
But... correct me if I'm wrong, injecting alcohol directly into a vein (intravenous), wouldn't this result in an un-wanted amount of Bacteria entering the bloodstream? Alcohol and it's whole fermentation process relies off of the natural sugars and Bacterium that grow with it, in order to make it "intoxicative".
I'll tell you one thing, whether it releases wanted effects or not, injecting alcohol is not a very hygeinic means for administering the spoken substance. Of course relatively pure alcohol will bruise, or... cause an intense burning sensation, due to the fact alcohol is a highly flamable substance.
Trust me on this one peoples... if you're gonna intravenously inject alcohol directly into your veins on a regular basis, expect there to be some very painful repurcussions to be suffered.
With all the impure drugs circulating the black-market in this day and age, it makes intravenous-injection a not-so-healthy mode for adminitration. "Bedroom-Solutions" readily prepared for injection, contain a relative amount of impurities, due to the environment the drug would've been manafactured in, dirty hands the drug has passed through, and... the amount of cutting agents used to adulterate the drug. This means that you are susceptable to catching Hepatitic diseases (not good for the liver). Why would you want to increase your risks of scarring your liver, by injecting alcohol (followed by bacteria).
Ohhh, on a side-note:- I am totally aware that people heat their substance before injection, definately reducing the amount of bacteria and other nasties found in your solution. Alot of people are under the misconception that heating what they are about to inject is going to totally rid the nasties out of (whatever-the-substance may be). Yeah, it will destroy alot of the bacteria and other impurities (remember not all), but... just make sure to take extremes, in order to be sure that your whole environment you are administering your drug of choice in...is a sterile/sanatised one. From the room your injecting in, to that (probably) filthy spoon used to heat your shit up-on.