Rule #1
NEVER COOK DRUGS
I had to post that first, so the OP doesn't do something stupid and cook drugs. I'll post it like that and if you give me a second I will post what else I have to say
Cooking drugs changes the solubility of different fillers found in the drug, and can allow them to dissolve in water and enter your shot. They can then solidify either in the needle, clogging it, or after shot. Either way this is not good.
There is a thread around here, other drugs, that lists the solubility of the benzo's. Most have a really low solubility. This doesn't not mean that they can't be shot, as a lot can, however it would take a lot of water, and personally would be a waste.
I used to shoot klonopin before, and sometimes mix a little kpin with some heroin. This wasn't the best idea, although K Pin had a solubility that wasn't horrible. I shot up once and had a horrible pain run through my arm, and a pain in my chest, I fell to my knees gasping. I believe I had a heart attack.
While pure clonazepam won't cause any problems when injected, I believe I injected some of the filters and that did some damage to my heart
long story short
Do NOT heat pills
Do NOT inject benzos.
They have a high tolerance either orally or sublingually + orally. Personally I just put them under my tongue untill they dissolve, then I swallow, and find that works best (although swallowing them whole still works fine) they have a close to ~100 percent bioavailability and bypass first pass metabolism.
So don't try to chase some high that isn't there, just take them normally. You'll still feel it, except not risk the dangers.