I'd say that the wd's would be similar to those of people kicking fentanyl or morphine...5-7 days for the physical stuff. Oxy was my drug of choice, and it took me 6 days or so to kick the worst of it. All people are different, though. Maybe someone can chime in with experience with this drug...
I personally dont have any experience with nalbuphene hydrochloride. Its not very common.
is it like synthetic morphine?
it all depends on alot of different things. You will go through ups and downs but just remeber you came this far and it is not worth going through the wd's all over again. Push yourself to do things to keep your mind off of it...and know that we are all here for you.