Propoxyphene
"I was so happy to re-discover Darvon.  I had taken it 30 years earlier for severe menstrual cramps when I was in high school and it worked great.

I re-discovered it because I have a terrible reaction to adhesives used with tooth-crowning.  Lortab and various other current drugs, did not work, but the oldie but goodie Darvon did.

I now use it for general pain associated with MS and it works like a charm.

BONUS - It's much cheaper than the newer, highly addictive pain killers."