Lorazepam is a prescription medical treatment used to manage anxiety. Lorazepam belongs to a class of drugs known as benzodiazepines which act on the brain and nerves (central nervous system) to produce a calming effect that relieves symptoms of anxiety. Lorazepam calms the nervous system, but it comes with real risks. Learn how it works, what it treats, and why dependence is a concern. Find patient medical information for Lorazepam (Ativan, Loreev XR) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Lorazepam belongs to a class of medications called benzodiazepines. It is thought that benzodiazepines work by enhancing the activity of certain neurotransmitters in the brain. Lorazepam is used in adults and children at least 12 years old to treat anxiety disorders. Detailed Lorazepam dosage information for adults, the elderly and children. Includes dosages for Anxiety, Insomnia, Status Epilepticus and more; plus renal, liver and dialysis adjustments. Lorazepam is a prescription anti-anxiety drug used to treat anxiety disorders and anxiety associated with depression; insomnia, panic attacks, and seizures. Common side effects are weakness, dizziness, unsteadiness, and headache. Lorazepam is in a class of medications called benzodiazepines. It works by slowing activity in the brain to allow for relaxation. How should this medicine be used? Lorazepam comes as a tablet, an extended-release capsule, and concentrate (liquid) to take by mouth with or without food. How long does it take for lorazepam to work? When starting lorazepam, anxiety or insomnia may improve rapidly or over a period of days or within hours of the first dose of medication. Summary of Black Box Warnings Lorazepam is a benzodiazepine that works in the brain to relieve symptoms of anxiety. Benzodiazepines are central nervous system (CNS) depressants, which are medicines that slow down the nervous system. This medicine is available only with your doctor's prescription. Lorazepam, sold under the brand name Ativan among others, is a benzodiazepine medication. [15]. It is used to treat anxiety (including anxiety disorders), insomnia, severe agitation, active seizures including status epilepticus, alcohol withdrawal, and chemotherapy-induced nausea and vomiting. [15].