Apr 25, - Stability data: Drug, Stability Refrigerated, Stability Room Temp. Reconstituted Vial/Powder, Notes, P-Insert Updated. Ativan - Lorazepam, Store. Lorazepam, Ativan. Injection, USP C-IV. Ativan. Generic Name: ATIVAN Lorazepam Injection, USP C-IV. Brand Name: ATIVAN® Storage + Safety: Store in. Intact vials of LORazepam should be refrigerated. The product may be stored for up to 2 weeks at room temperature. Both the physical and chemical stability are acceptable for up to 60 days at room temperature.