Yes this is true, same here in England. They are more often than not Codeine and Acetaminophen. Over here they come in 5/500 and 30/500 (codeine/acetaminophen). Sometimes they contain caffeine as well. Sometimes it's codeine and ibuprofen.
Most of the that nasty Acetaminophen can easily be removed using "Cold Water Extraction" meaning you can take larger doses of codeine with less damage to your liver,do a search on here. there's loads of posts about it. Caffeine can be a lot harder to remove, and will often over power the effects of the codeine, which is annoying, but it's easy to find pills without the Caffeine in them.
But yeh, just do a search for Codeine, and Cold Water Extraction. You'll get all the info you need.