LARCs cause changes in your uterus that create a toxic environment for sperm. They prevent sperm from traveling from your uterus to your fallopian tubes, where they could potentially fertilize an egg. Contraceptive implants also interrupt your menstrual cycle.
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Many women choose IUDs and implants as their primary form of birth control because they’re:
Certain types of LARCs offer additional benefits, such as:
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All LARCs may disrupt your period. Copper IUDs may lead to heavier bleeding and more painful cramping during your period. Hormonal IUDs lessen period bleeding and may cause you to miss periods (amenorrhea). Implants can have either effect. These irregularities may last for several months or even a year before your period returns to normal. Your period may be irregular for the entire time you have your IUD or implant.
Side effects may include:
LARCs are considered safe, with very little risk of complications. When they do occur, complications may include:
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Your pregnancy may be considered high-risk if you do become pregnant. Given how effective implants and IUDs are, your chance of becoming pregnant is slim.
Long-acting reversible contraception is one of the most effective forms of birth control you can choose.
Talk to your provider about the potential benefits of LARCs, based on your health and lifestyle. Don’t forget to protect yourself from STIs, too. Using LARC with condoms can prevent pregnancy and decrease your risk of contracting STIs.
Your birth control needs to work for you. At Cleveland Clinic, we help you find the right birth control option to fit your goals and lifestyle.

Last reviewed on 06/14/2022.
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