"I&#039;ve only had the mirena for 2 weeks but so far the only side effects I&#039;ve notices are increased sex drive, increased energy (which were both low before) and DEcreased appetite. Wow... wasnt expecting those but I&#039;m extremely pleased and crossing my fingers it will stay this way. I&#039;ve had some minor cramping and spotting every couple of days but no big deal. I will say that the insertion was incredibly painful for me. I felt like I was about to faint it was so bad, but the doctor said it was because I my cervix has never been dilated before (no kids). I would advise anyone like me to not plan any other activities the for the day of, just in case. But overall I am super happy with this thing."