I would strongly advise against taking that much ibuprofen, especially if you do it more than once. Ibuprofen is extremely irritating to the stomach lining and even though you might not feel anything adverse, there would almost certainly be some damage occurring.
Why bother just dumping the pills in your mouth when you can do a CWE and have the codeine extracted in 5-10 minutes?? Stop being lazy people! CWE's are piss-easy to do, and you don't have to swallow the rest of the crap in the tablets to get the effect you're after. Be SAFE and treat your body with at least some respect.
*edit* Oh, and I'm not sure if it's been said in this thread but you should never EVER take more than 5000mg of paracetamol/APAP at once. EVER!! (that is only 10 x 500mg tablets, not very much when you're trying to get the codeine effect). It is extremely dangerous to go higher than that dosage, and paracetamol overdose is a pretty darn easy way to kill your liver, or just plain die
Well it wasnt all at once and yeah, it was a one off, im not stupid enough to do that regularly.
And if the daily maximum dose for ibu is like.. 2000mg or 2500mg, then doubling that i dought would do much damage wise. Some people take over a hundred nurofen plus a day in NZ and manage to still be kicking.