Klonopin contains clonazepam, belongs to benzodiazepine class. It is a prescribed medication used to treat certain medical conditions involving the nervous system, such as seizure disorders and anxiety disorders. It also relieves panic attacks (sudden, unexpected attacks of extreme fear and worry about these attacks). Klonopin (clonazepam) works by balancing the activity of the brain's neurotransmitter system, specifically through its interaction with gamma-aminobutyric acid (GABA) receptors.