Scotty B

Hi all, I have recently purchased some 'generic' Propecia from an online pharmacy, it all looks genuine, and appears to be made by Merck, but is there any difference between this and the branded tablets? Also, a qwuick look on the Merck website shows that the tablets are supposed to be a hexagon shape or something, these are yellow and round with an 'm' stamped on them, is this right? Any help would be greatly appreciated, thanks guys!