Copper
"I've had mine in for 4 months and I am getting it removed next month. I'm really bummed this didn't work for me as I have tried many of the hormonal types of birth control and discontinued because I always endured terrible side effects. I decided to discontinue this because the cramping I have is becoming unbearable. I have cramping 3 out of 4 weeks and I have to take 4x 800mg ibuprofen. Before I had my period for 3-4 days and would have bad cramping for one day that could be fixed by taking 1-2 500mg tylnenol tablets."