What type of contraceptive is Nexplanon classified as?

Nexplanon is classified as a progesterone-only contraceptive method. It is a subdermal implant that releases a steady dose of etonogestrel, a synthetic form of the hormone progesterone. This hormone works primarily by inhibiting ovulation, thickening cervical mucus to prevent sperm from reaching an egg, and thinning the uterine lining, which decreases the likelihood of implantation should fertilization occur.

This classification as a progesterone-only method is significant because it provides benefits for women who may not be able to use estrogen-containing contraceptives, such as those who are breastfeeding or have certain health conditions. The implant is very effective, providing long-term contraception for up to three years with a single insertion.

In understanding other contraceptive methods, combination oral contraceptives include both estrogen and progestin; barrier methods act as physical barriers to sperm; and intrauterine devices function by creating an environment that is inhospitable to sperm and eggs, but none of these classifications fit Nexplanon, which solely relies on the action of progesterone.