Clonazepam (marketed by Roche under the trade-name Klonopin® in the United States and Rivotril® in Canada and Europe) is a anticonvulsant sedative-hypnotic anxiolytic (anti-anxiety drug), and a member of the benzodiazepine class of drugs. As other benzodiazepines, clonazepam is believed to act by simulating the action of GABA on the central nervous system.