Six-year contraceptive efficacy and continued safety of a levonorgestrel 52 mg intrauterine system.
- Author(s): Westhoff, Carolyn L
- Keder, Lisa M
- Gangestad, Angelina
- Teal, Stephanie B
- Olariu, Andrea I
- Creinin, Mitchell D
- et al.
Published Web Locationhttps://doi.org/10.1016/j.contraception.2019.10.010
OBJECTIVE:To assess 6-year contraceptive efficacy and safety of a levonorgestrel 52 mg intrauterine system (IUS). STUDY DESIGN:We assessed pregnancy rates through 72 months in women aged 16-35 years at enrollment and safety in all participants (aged 16-45 years, n = 1751) in an ongoing 10-year phase-3 trial. RESULTS:Over six years, nine pregnancies occurred (none in year 6) for a life-table pregnancy rate of 0.87 (95% CI 0.44-1.70). Adverse event rates remain low through 6 or more years of use. Two expulsions occurred in year 6. CONCLUSION:This levonorgestrel 52 mg IUS is a highly effective and safe contraceptive over 6 years of use. IMPLICATIONS:The levonorgestrel 52 mg IUS shows high 6-year contraceptive efficacy and a low rate of adverse events through 6 or more years of use.