Levonorgestrel
"I got Kyleena inserted on 4/20 for my extremely painful periods. Yes, the day of insertion was hell on earth. The 2 cramps that occurred during the insertion were the worst pains I have ever felt. Tears ran down my face, I became white as a sheet, & almost passed out (I also took 800mg of ibuprofen 40 minutes prior). The nurse brought me water, & I was ok to get up and walk to my car after 5-7 minutes of laying down. Buy the heating pads that stick inside your underwear! They are a life saver. Those, ibuprofen, hot tea, & a snuggly boyfriend were very helpful. I had cramps & spotting for 2 days after & have not had any symptoms since except for some minor rare cramping. I LOVE IT! The initial pain is WELL WORTH the benefits now. :)"