Ativan (Lorazepam) is used in the treatment of anxiety, insomnia, and seizures. It belongs to a class of drugs known as benzodiazepines. They act on the central nervous system and produce a soothing effect. The effects of GABA are enhanced by the use of Ativan. Ativan has a calming action on the central nervous system and has absolutely no effect on the respiratory system or the cardiovascular system. Lorazepam binds with plasma proteins. It is a central nervous system suppressant.