Ativan (lorazepam) is a benzodiazepine medication commonly prescribed for anxiety, insomnia, seizure disorders, and muscle spasms. Ativan is available in oral tablets and injectable forms. The oral tablets are typically prescribed in doses ranging from 0.5mg to 2mg, depending on the severity of symptoms. Ativan usually starts working within 30 minutes, with effects lasting 6 to 8 hours, making it suitable for managing acute anxiety episodes or helping with sleep disturbances.