David_Gerard comments on Study shows placebos can work even if you know it's a placebo - Less Wrong
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May be true on average, but YMMV. I find it slightly less effective than paracetamol (Tylenol) and way less than codeine. (I have a dodgy back and a keen interest in painkillers at times.)
Codeine is almost always mixed with tylenol or another painkiller, and in its mixed form is more effective than pure codeine or ibuprofen. I meant that pure codeine is about as ibuprofen (not by weight, but by equivalent dosages) but it's not really a useful comparison because pure codeine is rarely prescribed.