A: Lorazepam is a medication that is used to treat anxiety. It belongs to a class of medications known as benzodiazepines which help to produce a calming effect by acting on the brain and nerves (central nervous system).orazepam is intended to be taken only for a short period of time. Do not take this medication for longer than 4 months without your doctor's advice. Talk to your doctor about using alcohol while on lorazepam. Alcohol can worsen the side effects of lorazepam, such as drowsiness, confusion, and unsteadiness.