"i used this for the full five years after having my 2 kids.  i had no side effects except perhaps that my weight stabilized at a higher weight than pre-pregnancy days. my husband occasionally said he could feel the string. at the very end of use i had night sweats and extreme weight fluctuations (up and down by 20  lbs). i recommend getting it removed as soon as symptoms start. this was very cost effective long term although initially a high cost.  when considering the monthly cost of other forms this was less.  in addition with no periods, there was no cost for pads/tampons or pain medication for cramping.  i&#039;m now back on pills, but miss the mirena.  i now have mood swings, motivation issues, weight gain, acne, and normal period issues."