Feb 5, - Ativan, the brand name for lorazepam, is a fast-acting benzodiazepine used to treat anxiety. Its addictive potential makes it unsafe for. Mar 10, - Learn about Ativan (Lorazepam) may treat, uses, dosage, side effects, drug interactions, warnings, patient labeling, reviews, and related ?Ativan (Lorazepam) · ?Side Effects · ?B.i.d. Lorazepam, sold under the brand name Ativan among others, is a benzodiazepine medication. It is used to treat anxiety disorders, trouble sleeping, active Onset of action?: ?1–5 min (IV), 15–30 min (IM).