The Etonogestrel (Nexplanon) implant for contraception contains which hormone?

• A. Estrogen only
• B. Progesterone only
• C. Equal amounts of estrogen and progesterone
• D. A higher dose of progesterone than estrogen

Answer: (B)

The Etonogestrel implant, commonly known as Nexplanon, contains the hormone progesterone only. This progestin works primarily to prevent ovulation, thickening cervical mucus to inhibit sperm passage, and thinning the endometrial lining, reducing the likelihood of implantation.

This method of contraception is highly effective and offers a long-lasting solution with fewer side effects associated with estrogen, making it suitable for women who may have contraindications to estrogen-containing contraceptives. The use of progesterone alone helps to minimize the risk of estrogen-related side effects, such as thromboembolic events, making it a safe option for various populations, including those who are breastfeeding or have a history of certain hormonal-related health issues.

The other options involve combinations or the presence of estrogen, which is not applicable in the case of Nexplanon, hence reinforcing the correctness of the choice indicating that it contains progesterone only.