An intrauterine device (IUD) is a device placed in the uterus to prevent the egg from implanting in the uterine lining, and also to prevent fertilization.

One or more matchstick-sized rods containing the hormone progesterone are implanted under the skin. Once implanted, the rods gradually release hormones into the body, creating a long-lasting contraceptive effect that can last up to 5 years.

The contraceptive implant method is up to 99% effective. Using a contraceptive implant while breastfeeding is a safe method to help mothers avoid unwanted pregnancies.