Oxycodone
"I was given oxycodone for pain relief in the hospital after hip replacement surgery.  The pain relief was okay, but the side effects of nausea, confusion, and weakness made me feel wretched.  Who wants to throw up repeatedly and feel pathetic after surgery?  As soon as my surgeon swapped oxycodone  for tramadol, the bad side effects disappeared. Tramadol's pain relief was comparable or better. I'm amazed by all these high ratings because many friends had similar bad side effects with oxycodone."