At day 4, I still had significant pain and was taking oxycodone every 4 hours and miserable if I didn't. The pain started dropping off quickly around day 10. I say that, not to set up expectations, but because it was not at all predictable to me the way the course of the pain went. If you need them, take them. Like Sarah said, they actually can't give a refill for Percocet and oxy until you use up the first one. You need to get a fresh script b/c of the Schedule the drug is listed as. I'm sure you can get a new script if needed.