Having suffered with kidney stones on and off for the last 20 years I have been prescribed several pain killers over this period. They used to give me Pethadine, which used to work, but usually knocked me out and left me feeling 'spaced out'. Then they changed to prescribing Diclofenac, which didn't do anything for me. The last time I ended up in hospital with a stone stuck in my 'tubes', they tried every thing including Morphine, but the only thing that finally worked was a combination of Tramadol and Paracetamol, before the stone moved enough for them to go in and get the bugger out. Stayed on Tramadol and Paracetamol for a few days after the event with no side effects.