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My understanding is codeine takes a beating in the digestive tract, getting like 90% destroyed before the liver can convert it to morphine as opposed to hydro and oxy.
It's not THAT bad, and you can block some of it by drinking grapefruit juice beforehand. You're totally right about hydro and oxy - between 70-85% of it gets to you, after digestive system absorption and processing, which is very good.