Thank you everyone for your input. My surgeon chose dilaudid instead of oxycodone for pain relief for the second knee and it's actually a big improvement. I was able to successfully and fairly easily wean off the oxy in 2 weeks without horrible side effects at all. I am expecting to do the same with the dilaudid. With the latter, I was much more clear headed, did not get the oxy "rash" and "itch" issues, and pain management seemed more effective. I am very pleased with the change in medication as a way to improve effectiveness.