Ativan is used to treat anxiety disorders or for short-term relief of the symptoms of anxiety, such as tension and nervousness, as well as certain types of seizures. Buy Ativan Online, may also be used for other conditions as determined by your doctor. Ativan (lorazepam) is in a class of medications called benzodiazepines (ben-zoe-dye-AZE-eh-peens). It works by slowing down the movement of chemicals through the brain that may become unbalanced.