My Sister Takes A Lot Of Pain Medicine--hydrocondone, Oxycodone And

My sister takes a lot of pain medicine--hydrocondone, oxycodone and all she does is sleep and eats sweets--lots of candy and cookies. She has been on these medications for over a year. I think that she needs to come off of these medications but her doctor continues to write her scripts for them whenever she tells them that she is out and needs a refill. What can I do to convince her or her doctor to cut back on these scripts or discontinue them for a little while. Thank you in advance for any advice you can give me. Shirley E. Brown, Petersburg, VA.