Ativan white paper said:Lorazepam is a nearly white powder almost insoluble in water. Each mL of sterile injection contains either 2.0 or 4.0 mg of lorazepam, 0.18 mL polyethylene glycol-400 in propylene glycol with 2.0% benzyl alcohol as preservative.
Why u wanna inject it tho....the oral ba is 99%
most benzos won't dissolve in "wet" propylene glycol. so you can't use water-glycol mixtures
depending on what you want to inject, you probably need some combination of propylene glycol, high proof alcohol & a preservative to ensure solubility. as a result the injection must be done slowly and carefully or you'll fuck your veins up.
also, micron filtering would be a really good idea... or just using benzos orally/sublingually.