Just read a bit about it. It seems to be one of a new class of drugs that began in Europe that are basically looking at melatonin rather the usual suspects. But melatonin will only work well if the problem is your Circadian rhythms are off -- if your sleep problem is from another cause, this might not work. One thing about using melatonin is the dose -- most people take too much, thinking more is better. With melatonin, less is usually better -- when it was first studied it was determined not to work because they used too high a dose. This drug appears to mimic melatonin kind of like neurontin mimics GABA. The fact a drug is controlled or not isn't really what we worry about. What we worry about is the side effects and difficulty quitting a medication that alters the way the body works naturally. As this seems to be a newer drug, there probably isn't a lot of info yet on how people do with it long-term. Remember that antidepressants are not controlled substances but have pretty much the same difficulties when you try to stop taking them, depending on the person. I'm guessing that if clonazepam, which is not a sleep remedy but an anxiety remedy, worked for you, your problem is anxiety and not a melatonin problem, but that doesn't mean either melatonin or this drug might not work for sleep. It does mean it won't solve your problem if it's an anxiety problem and not a sleep disorder alone. Only trying it will probably tell you how it will affect you.
You might want to ask your doctor if mirtazapine will help you. It helped me a lot!
I take the lowest dose (15mg) and don't have any problem with weight gain. I take it about
30 minutes before going to sleep and I sleep soundly for 7 to 8 hours with no morning drowsiness like some of the PM tablets.
Just about three years now.