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. 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. Lorazepam is used in the short-term management of severe anxiety. In the US, the Food and Drug Administration (FDA) advises against use of benzodiazepines such as lorazepam for longer than four weeks. [25][31] It is fast-acting, and useful in treating fast-onset anxiety and panic attacks. [32] View lorazepam information, including dose, uses, side-effects, renal impairment, pregnancy, breast feeding, contra-indications and important safety information. 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. 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 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 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. Learn about lorazepam (Ativan) usage and dosing. Read the latest news and reviews about the drug as well as potential side effects and popular alternatives. Find patient medical information for Lorazepam (Ativan, Loreev XR) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings.