If you are looking to inject a benzo get yourself some Midazolam. Half of a 7.5mg pill (3.25mg) or a quarter of a 15mg will give you an amazing rush and that is with a decent benzo tolerance. If your tolerance is low start much lower, like maybe .5-1mg.
Make sure to Micron Filter and make sure you’re in a safe place with a sitter as I have seen as little as a quarter of a 15mg pill completely put people under.
Also I would suggest that you get a very small number of pills as the rush is crazy, and I mean CRAZY addictive. Especially once you are under the influence of the drug you may find it almost impossible to resist obsessively re-dosing like its crack.
Just to give you an example, I went through 1500 out of 2000 15mg pills in about 3 months MAX, and the only reason I only did 1500 is because the 15th time my Mom came to my house because I was not picking up my phone and found me unresponsive because I was basically in a benzo induced coma I had left the bag with the last 500 on the table. Needless to say those pills are gone (or maybe somewhere in moms house, but I have not found them yet).
So if you really want to go this direction just know what your getting yourself into and be as safe as you can.