From the wikipedia page for Lorazepam:
"Pure lorazepam is an almost white powder that is nearly insoluble in water and oil."
"Lorazepam injectable solution is administered either by deep intramuscular injection or by intravenous injection. The injectable solution comes in 1 mL ampoules containing 2 mg or 4 mg lorazepam. The solvents used are polyethylene glycol 400 and propylene glycol. As a preservative, the injectable solution contains benzyl alcohol.[38] Toxicity from propylene glycol has been reported in the case of a patient receiving a continuous lorazepam infusion.[39] Intravenous injections should be given slowly and patients closely monitored for side effects, such as respiratory depression, hypotension, or loss of airway control."