I have no direct experience but from the info I've been gathering over the years, there are mixed reports.
If you're crossing borders/flying - Some have been able to sneak it in with their other medicines without any problems. But some also had it confiscated, can't remember what the consequences were - fines or detention etc. I guess it also depends what your country is, better check what the laws and the penalties are. In theory you could transfer it to another container but that will impact sterility and who knows if N will stay effective this way - so in practice, I don't think it's a good idea. I am also thinking you could take off labels and replace them with some fake labels of a totally legal substance that looks similar. Although if you have like four bottles it may raise some questions.
If you're shipping - I think I would definitely swap labels and declare some nonsense on the customs form. Like, are they really going to check if it's N? Anyway, it looks like it's doable as some have done it, but it is risky nevertheless.