[Stagebear]

How's this:
Tell the prescribing doctor that you are addicted and need to stop.
Call the pharmacy and tell them you've developed an allergy to oxycodone and need to assure they don't fill any future prescriptions.
Find a support group nearby.
When we're in the throes of withdrawal, swearing off refills and such is pretty easy. But when opportunity and desire cross paths, addicts are off to the races in no time.
All of the above presumes a real desire to quit, not just dealing with the days until you can get a refill.