Editing Copper IUD (section)

=== Emergency contraception ===
It was first discovered in 1976 that the copper IUD could be used as a form of [[emergency contraception]] (EC).<ref>{{cite journal | vauthors = Lippes J, Malik T, Tatum HJ | title = The postcoital copper-T | journal = Advances in Planned Parenthood | volume = 11 | issue = 1 | pages = 24–29 | year = 1976 | pmid = 976578 }}</ref> The copper IUD is the most effective form of emergency contraception, more effective than oral hormonal emergency contraception, including [[mifepristone]], [[ulipristal acetate]], and [[levonorgestrel]].<ref>{{cite journal | vauthors = Cheng L, Gülmezoglu AM, Piaggio G, Ezcurra E, Van Look PF | title = Interventions for emergency contraception | journal = The Cochrane Database of Systematic Reviews | issue = 2 | pages = CD001324 | date = April 2008 | pmid = 18425871 | doi = 10.1002/14651858.cd001324.pub3 | veditors = Cheng L }}</ref>{{Update inline|reason=Updated version https://www.ncbi.nlm.nih.gov/pubmed/22895920|date = March 2025}}<ref>{{cite journal | vauthors = Ramanadhan S, Goldstuck N, Henderson JT, Che Y, Cleland K, Dodge LE, Edelman A | title = Progestin intrauterine devices versus copper intrauterine devices for emergency contraception | journal = The Cochrane Database of Systematic Reviews | volume = 2023 | issue = 2 | pages = CD013744 | date = February 2023 | pmid = 36847591 | pmc = 9969955 | doi = 10.1002/14651858.CD013744.pub2 | collaboration = Cochrane Fertility Regulation Group }}</ref> Efficacy is not affected by user weight.<ref name=":2" /> The pregnancy rate among those using the copper IUD for emergency contraception is 0.09%. It can be used for emergency contraception up to five days after unprotected sex, and does not decrease in effectiveness during the five days.<ref name="Cleland2012">{{cite journal | vauthors = Cleland K, Zhu H, Goldstuck N, Cheng L, Trussell J | title = The efficacy of intrauterine devices for emergency contraception: a systematic review of 35 years of experience | journal = Human Reproduction | volume = 27 | issue = 7 | pages = 1994–2000 | date = July 2012 | pmid = 22570193 | pmc = 3619968 | doi = 10.1093/humrep/des140 }}</ref> An additional advantage of using the copper IUD for emergency contraception is that it can then be used as a form of birth control for 10–12 years after insertion.<ref name=Cleland2012 />