Hydromorphone
"I received this medication in the ER for kidney stones.  Twice before the ER had given me Demerol for this pain and while it helped it did not completely give me relief.  THIS did! I do not know if it caused nausea or not, because they gave me Zofran along with it.  I know that if I am ever in severe pain again I hope the doctor will give me this medicine.  Also I had no memory loss like I do with morphine, which is a plus.  I only received it through IV."