I had the mirena IUD inserted in april 2005. I've gained weight, covered in acne both on my face and chest. Being to see a health visitor today, that's why i'm looking for more information because she convinced me the benefits outweight the side effects. I know i had heavy periods and now nil but the weight gain is killing me. My argument was - can i have anti- obesity pill to counter act the side effects of the coil? i was told to see my GP. fat chance for me now. Has anyone used a pill to control their weight gain? if so please let me know and was it effective.