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About the LNG IUS

How does the LNG IUS work?

How effective is the LNG IUS?

Client Information



The Levonorgestrel Intrauterine System (LNG IUS) is one of the most effective and long-acting contraceptive methods available. During the first year of LNG IUS use, the pregnancy rate is 1 to 3 per 1,000 women — a pregnancy rate of less than 1%. After the first year, there is a low risk of pregnancy throughout the duration of LNG IUS use — 5 to 8 pregnancies per 1000 women (a rate of less than 1%)1

1 World Health Organization Department of Reproductive Health and Research (WHO/RHR) and Johns Hopkins Bloomberg School of Public Health/Center for Communication Programs (CCP), INFO Project. Family Planning: A Global Handbook for Providers. Baltimore and Geneva: CCP and WHO, 2008.



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