If you are worried about them being detected on an upcoming drugs test, you should have nothing to fear if they were legally prescribed by your doctor. You can simply show the evidence of the doctor's prescription to anyone who may query your drug test result. However, if you are taking pain killers illegally then you may have some cause for concern.
If you feel you have an addiction to pain killers then you are certainly not alone. Many may feel it is not as serious as other drug addiction, but this is not really the case. Pain killer addiction can have the same devastating affects on a person's life and can be just as difficult to overcome as addictions to hard illegal drugs such as heroin and cocaine.
It is highly advisable to seek help if you do have a pain killer addiction. This can be done by booking an appointment with a doctor; they will be able to refer you to the most appropriate help such as drug counsellors. Admitting you have a problem is the first and sometimes hardest step to recovery from any drug addiction. It will not be an easy time to go through, especially alone, but the eventual outcome will lead to far more healthy and productive lifestyle.