Is is OK to split Proscar tablets?

[Anon111]

I know a lot of people do this to take the 1mg, but I've been looking around and I found this website, which had Proscar 5mg on the "Do Not Split" list.

http://www.australianprescriber.com/magazine/25/6/133/5

Does cutting the tablet reduce its effectiveness at all? Obviously you're exposing the inside of the tablet to air and all that, but does that matter?