"i am 25 and have been taking 7.5/500 percocet since i was 15 (10 years) and it used to work very well but its super easy to build up a tolerance and you have to wait a few weeks for it to go down so they also just started giving me 100mg of demerol which is fantastic. i have iga nephropathy, and nifridas, and calcuim kidney stones and will have to live with pain the rest of my life and it is very hard to find a doctor who will prescribe to someone my age who is really suffering."