"it does curb pain when all others may fail. i was on it for 1 1/2 yrs. make no mistake it is a powerful narcotic and it is addictive..caused major constipation,loss of appetite, intermittant nausea..in my case made me hyper active, anxious and contributed to long term insomnia. took more than a year for my body functions and physiology to return to normal after i stopped taking it. it did however allow me to function through intense pain when nothing else worked."