"i had my mirena inserted in march 2011. i had it in for 6 months and kept losing weight... it was great! i dropped about 10-15 lbs. the cons for me were: oily hair/skin, back acne (which i never usually have), and severe unexplainable joint pain. i had it removed 3 months ago due to the joint pain, as it was unbearable. i have started gaining weight (~5lbs) so i&#039;m thinking about trying the mirena again. "