I can eat pain meds by the handful (obviously) with little or no effects. If I take a Tylenol PM, I sleep for two days. Last night I just went to bed before they kicked in and only had to deal with a slight hangover this morn.
I don't see the attraction people have for abusing this stuff... actually I do, I used to do heroin... but this isn't like that. I don't much care for the effects. I try to take just enough to make the pain bearable without feeling the pills themselves. It's a balancing act! But... like I said- it beats the alternative!