Ok, I had surgery not to long ago on my knee. I started off on Oxy's 20, then went to percocets 7.5, then to percocets 5's. I am now on vicodins 5/500's. The perscribtion bottle says take 1 every 6 hrs or 2 every 8 hrs. I am 19 years old and im 6'0". I weight like 310, offensive lineman body. I take 2 every 8 hrs, but it really doesnt help. How much(max amount pills) can i take at once and still be safe. I dont really feel like having any breathing problems like the paper said that came with the pills about od on them. I would greatly appraciate responses. Thanks,