I don't think there is a 'normal' dosage of oxycodone. Oxycodone or oxycontin is available in a dosages ranging from 5 mgs to 80 mgs. Doctors will prescribe it depending on how much pain you are in. Given that I'm not sure what a normal dose is. Good luck with finding a good treatment for your pain.
http://www.healthcentral.com/druglibrary/408/oxycontin.html