do not EVER! inject insulin into a vein unless in a controlled enviroment i can have fatal consequences. The only insulin that can be used iv is humalin R. And that is usually mixed in a bag of iv fluid. You can use humalin R in a sub Q injection. start at only a couple units till you see how you react. and have some simple sugars immediatly available about 30 minutes after injection. watch for the side effects my man.Im not a guru here but this is some solid info.