This was one of the things that the National government had to concede in order to partner with Act to form the coalition government:

* Allow the sale of cold medication containing pseudoephedrine

phenylephrine (which doesn't do squat) has been sold to us for far too long just because it sounds like (and people confuse it for) pseudoephedrine (which works like gangbusters).

Side effect: meth labs will again have a source