Incidentally, @Medievalist isn’t pushing a wild conspiracy theory here.
“The paracetamol in codeine/paracetamol pills is there primarily to kill you if you try to use them recreationally” is considered a fairly obvious fact in the psychopharmacology research community.
Yes it would. But the US government has decided to have a war against opiate abuse, so they’d rather you die of liver failure than be able to abuse oxycodone without consequences.