Ativan is a highly effective benzodiazepine medication for treating anxiety, insomnia, seizure disorders, and other medical conditions. Its effects are immediate and last for several hours. Doctors prescribe it to help relieve symptoms, but remember that Ativan is a powerful medication.To produce a calming effect, Ativan binds to receptors in the brain. It also reduces the activity of the neurotransmitter GABA, which regulates anxiety levels in the brain.