How many people are addicted to prescription painkillers?

Painkiller addiction. There are a lot of different types of "painkillers". The class of medications associated with the development of addiction are the opiates like morphine, codeine, oxycodone, fentanyl, etc. Genetically about 15 to 20% of the population seems to be at risk for the development of addiction which is different than the physical dependence which most people will get on opiates if on them long enough.