As of Sept 2012, I know that it has been approved in Japan with the approval date as 30/03/2012 and submitted in the USA FDA in 27/09/2007.
http://www.the-medications.net
Yes, desmopressin is approved for the treatment of nocturia in adults. It is a synthetic form of the hormone vasopressin, and it works by reducing the production of urine during the night, thereby reducing the frequency of nocturnal voiding episodes.
In the US and UK, at least, desmopressin is a prescription medication. So the answer is "yes, if you have a prescription for it". I think. I'm not sure how you wacky Brits do things.
A drug used in the treatment of von Willebrand's disease.
urgency
Controlling bleeding disorders, such as Von Willebrands Disease.
Von Willebrand's disease can be treated with desmopressin (DDAVP, Stimate).
Nocturia
nocturia, bed-wetting at night
Excessive urination at night when you wake up several times is called nocturia. There are many causes but most likely is too much to drink before sleeping. Keeping tract of all fluid intake can help if you need to see a doctor.
Nocturnal enuresis-- Involuntary discharge of urine during the night.
It's used to help control bleeding disorders, such as Von Willebrands. Von Willebrands is basically that your blood doesn't clot. For example, say you have Von Willebrands and you cut yourself, Desmopressin Acetate helps your blood clot. I have Von Willebrands and I've used this before.
There is a medicine called DDAVP (desmopressin). Talk to your sons doctor about it.
I had to call the pharmacist because we had lost ours for a few days. It can be kept not refrigerated for up to 3 weeks.