Copper
"INSERTION DID not hurt at all!!! I had the best experience. Ladies, please ask your doctor about  Cytotec (misoprostol). My doctor prescribed it to me so I could take it (by mouth) the night before the procedure and it is supposed to help with opening up the uterus so that during the actual procedure the doctor won't have to dilate your uterus as much. The only "uncomfortable" part about it was when she disinfected it. It was like a slight burning sensation that lasted 3 secs. Then when she actually inserted the IUD I felt a slight pressure. Felt like a bad cramp that lasted like 8 secs. I also took a 400 mg 30 minutes before. Afterwards I felt a little cramping but nothing terrible. I highly recommend this! Don't psych yourself out. :-)!"