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). Ativan Tablets is a brand of medicine containing the active ingredient Lorazepam. Find out about side effects, who can take it and who shouldn't use Ativan T. Jul 18, - Ativan (lorazepam) is a common medication used for the treatment of panic disorder and other anxiety conditions. It's a type of benzodiazepine.