Klonopin etc. (clonazepam) is a benzodiazepine medication used to treat convulsive disorders such as epilepsy, and to relieve panic disorder and anxiety.
Benzodiazepines like Clonazepam act by enhancing the actions of a natural brain chemical, GABA (gamma-aminobutyric acid). GABA is a neurotransmitter, a chemical that carries messages between brain nerve cells. GABA inhibits the transmission of nerve signals, thereby reducing nervous excitation.