In the UK they seemingly just removed all the active ingredient. I couldn't understand how it wasn't working for me, Sudafed had been an almost miraculous way to clear a head cold (mucus blocked sinuses); then it just didn't work anymore. Of course they put caffeine in to try and make it feel like it was working ...

Recently, after careful analysis I found they do still make it (or they make it again), but it was a definite bait-and-switch.