Hydromorphone
"My first kidney stone.  Very painful.  Went to ER since I didn't know what was happening.  Cat scan = kidney stone ~2mm.  I wasn't going to die and it would pass.

They 1st gave me IV morphine.  That took the pain down about 20% to a manageable but still very painful level for about 10 minutes then it jumped back up as if I'd had nothing.

They then gave me Dilaudid saying it worked on different receptors.  In 2 minutes the pain dropped about 75% and stayed down for about 4 hours until it wore off.

Dilaudid seems to work differently than morphine. A great and powerful medication."