Ativan is a brand name for the generic drug lorazepam, which is a prescription medication used primarily to treat anxiety disorders, insomnia, and seizure disorders. Ativan belongs to a class of drugs called benzodiazepines, which work by enhancing the effects of a neurotransmitter called gamma-aminobutyric acid (GABA) in the brain. GABA is responsible for reducing the activity of nerve cells in the brain, which can help to relieve anxiety and promote relaxation. Ativan is taken orally and is available in tablet, oral solution, and injectable form. The dosage will depend on the patient's age, weight, and medical condition being treated.