Oxycodone
"I've been using the immediate release form of Oxycodone for many years frequently in combination with codeine for chronic back pain.  For me the combination is more effective than either alone.  I try to take the minimum dose necessary to control my pain, which for me is about 5 to 10 mg Oxy plus 60 mg codeine 3 or 4 times a day, depending on my level of physical activity.   As mentioned by others, tolerance and dependence or addiction (btw, not the same thing) are the main problems."