Klonopin, a benzodiazepine, is an FDA-approved anti-epileptic medication that helps to treat, manage and control anxiety and seizures, including absence seizures or Lennox-Gastaut syndrome) in adults and children. In addition, doctors frequently prescribe this medication to treat panic attacks, including agoraphobia. This oral prescription is classified as an anti-epileptic medication in the benzodiazepine class. Buy Klonopin Online. It works by increasing GABA levels and the activity and functions of specific chemical messenger neurotransmitters. GABA is an amino acid that is responsible for producing calming effects in the brain and nerve cells. Klonopin starts its effects within 1 hour, and its active duration is 6 to 12 hours.