What sort of medicine is ativan (lorazepam)?

Anti-anxiety. Ativan (lorazepam) is a medication used to treat anxiety, panic attacks in particular. It is in a class of medications known as benzodiazepines which share similar properties such as valium, klonopin, xanax, (alprazolam) and Librium the advantage is that it works quickly, but the risks are developing a physical dependence (tolerance over time and withdrawal when stopping it) or an addiction.
Anti-anxiety. It's a medicine for anxiety. It is short acting(approximately 4 hours) and while useful it can have side effects. There are risks of addiction, depression, sleepiness, and falls.
Ativan (lorazepam) Is anti-anxiety medication with short half-life, used mostly orally for generalized anxiety, intramuscularly in er for pain & headaches, intravenously or i.M. In seizure attacks.