There is a new pain medication out (strong like Oxy), and all that I know is that it starts with an "E". Can you help me?

My partner’s Aunt mentioned it on the weekend. She got off of Oxycontin (which she was taking after a knee replacement) because it made her throw-up. Now, she is on this drug and, so far, no side effects. Anyone know the name. It came out not long ago.