Mar 17, - Lorazepam is also used to treat insomnia, epilepsy, irritable bowel syndrome (IBS), agitation caused by alcohol withdrawal, and nausea and vomiting from cancer treatments. The drug belongs to a class of medications called benzodiazepines, and is available as oral tablets, an oral concentrate solution, and an injection. Mar 10, - Learn about Ativan (Lorazepam) may treat, uses, dosage, side effects, drug interactions, warnings, patient labeling, reviews, and related. Lorazepam belongs to a group of drugs called benzodiazepines. It affects chemicals in the brain that may be unbalanced in people with anxiety. Lorazepam may also be used for purposes not listed in this medication guide.