i was just wondering what the difference between codeine phosphate and oxycodone HCl is? i used to have a prescription for oxycodone (percocet?) and recently saw a friend with co-codamol which is the codeine phosphate. The oxycodone was 5/325 where the co-codamol is 30/500. i was wondering if the 5 compared to the 30 was relative or not.