Sorry for bringing up an older thread, but it's better than making a new one.
Let me chime in on here, I've never tried Nitrazepam, but I have RX'd Clonazepam.
I've done plenty of re-search on drugs, most including Benzos and Opiates.
Nitrazepam is a hypnotic drug of the benzodiazepine class, indicated for the short-term relief of severe, disabling anxiety and insomnia. It also has sedative and motor-impairing properties,as well as amnestic, anticonvulsant, and skeletal muscle relaxant effects.
Clonazepam is a benzodiazepine drug having anxiolytic, anticonvulsant, muscle relaxant, amnestic, sedative, and hypnotic properties. It is marketed under the trade name Rivotril by Roche in Argentina, Australia, Belgium, Brazil, Bulgaria, Canada, Colombia, Costa Rica, Croatia, the Czech Republic, Denmark, Germany, Hungary, Ireland, Italy, Mexico, Norway, Portugal, Peru, South Africa, the United States, and Spain; Linotril and Clonotril in India, South Korea, and other parts of Europe; and under the trade name Klonopin by Roche in the United States. Other names, such as Ravotril, Rivatril, Iktorivil, Clonex, Paxam, Petril, Naze and Kriadex, are known throughout the world. Clonazepam has an elimination half-life of 18–50 hours and is generally considered to be an intermediate-acting benzodiazepine. Clonazepam has no active metabolites. Clonazepam is a chlorinated derivative of nitrazepam and therefore a chloro-nitrobenzodiazepine.
Clonazepam has an intermediate onset of action, with a peak blood level occurring one to four hours after oral administration. Long-term effects of benzodiazepines include tolerance, benzodiazepine dependence, and benzodiazepine withdrawal syndrome, which occurs in one third of patients treated with clonazepam for longer than four weeks.
Benzodiazepines such as clonazepam have a fast onset of action, high effectivity rate, and low toxicity in overdose; however, as with most medications, it may have drawbacks due to adverse or paradoxical effects. The benzodiazepine clorazepate may be an alternative to clonazepam due to a slow onset of tolerance and its availability in a slow-release formula to counter fluctuations in blood levels. The pharmacological property of clonazepam, as with other benzodiazepines, is the enhancement of the neurotransmitter GABA via modulation of the GABAA receptor.
So, in conclusion, if you have chronic anxiety, Clonazepam is def. the better option, as stated above Nitrazepam is for short term use ONLY.
For me, Clonazepam is a god send, it lasts long, feels good, takes away my depression/anxiety, and overall is an EXCELLENT benzo.