Etonogestrel is a synthetic progestin widely used in hormonal contraceptives, particularly in the form of subdermal implants and vaginal rings. It prevents pregnancy by inhibiting ovulation, thickening cervical mucus to block sperm entry, and thinning the uterine lining to prevent implantation.

In subdermal implants like Nexplanon, it provides long-term birth control, effective for up to three years, offering a convenient option. In vaginal rings like NuvaRing (combined with ethinylestradiol), it releases steadily over three weeks, ensuring consistent protection.

Additionally, etonogestrel implants may help manage heavy menstrual bleeding by reducing blood loss. Its efficacy makes it a key component in reproductive health.