Hello, I only just found this site myself and am scheduled to have mine removed tomorrow (have had mine for 4 months). In searching for answers I have come across some ladies that have had their IUD's for 5 years and am sorry to say that the only thing I remember reading on their posts was the fact that one of them developed endometrious (which is the attachment of scar tissue in and around the uterus and other female organs). I myself have had it and had surgery to have it removed some 10 yrs ago. If you search this forum you'll find some ladies who have had their IUD's for the max time. Everyone here has been really great! I'm sure someone will have the insight you're looking for. Good luck to you and your sister, and all of us who have this D*mn thing!