Lorazepam, sold under the brand name Ativan among others, is a benzodiazepine medication. Interactive image . Lorazepam's effects are dose-dependent, meaning the higher the dose, the stronger the effects (and side effects) will be. U.S. National Library of Medicine: Drug Information Portal – Lorazepam. Find patient medical information for Lorazepam Oral on WebMD including its uses, side effects and safety, interactions, pictures, warnings and user ratings. Pictures of Ativan (Lorazepam), drug imprint information, side effects for the patient.