Clonazepam isn't worth shooting for a number of reasons, mainly its low solubility in water. It has a 90% oral Bioavailability. If you tried to inject it, you would not recover the vast majority of the active drug from the crushed pill and water solution- so you'd end up shooting water and a load of pill binders and fillers (inactive ingredients); which are the causes of the major health problems associated with injecting pills.
I don't recommend injecting Zolpidem. Aside from the numerous dangers associated with injecting pills, different people experience (or report) very different experiences with IV Zolpidem. Some people say it is stimulating; some say its caused them to immediately pass out; my experience was that it caused a general 'internal numbness' for a short period of time; and if used in combination with any other drug, it would ruin or 'kill' the effects of the other drug(s) in my system. Most people report that the most recreational effects of Zolpidem come from oral consumption or insufflation. As someone who has injected plenty of Ambien, I don't recommend it.
Each 10mg Ambien contains:
Several of those ingredients are the most damaging inactive ingredients found in pills when prepared for injection. Check out the Case Studies thread to see what happens to people who have attempted to inject pills with these same inactive ingredients.
If you insist on doing it, at the very least use a micron filter and a clean needle.