High Quality Content by WIKIPEDIA articles! Clonazepamis a benzodiazepine drug having anxiolytic, anticonvulsant, muscle relaxant, and hypnotic properties. It is marketed by Roche under the trade name Klonopin in the United States and Rivotril in Australia, Brazil, Canada and Europe(and in countries like Serbia, Macedonia, Croatia and Montenegro). Other names such as Ravotril, Rivatril, Clonex, Paxam, or Kriadex are known throughout the rest of the world. Clonazepam has an unusually long half-life of 18–50 hours, making it generally considered to be among the long-acting benzodiazepines. Clonazepam is a chlorinated derivative of nitrazepam and therefore a chloro-nitrobenzodiazepine.