How Nexplanon Works as a Progesterone-Only Birth Control Method
Nexplanon is a small, flexible implant placed under the skin of the upper arm that releases the hormone etonogestrel, a type of progestin, to prevent pregnancy. It works primarily by thickening cervical mucus to block sperm, thinning the uterine lining, and in many cases, stopping ovulation altogether. Because it contains no estrogen, it is classified as a progesterone-only method, which makes it an option for people who cannot use combined hormonal contraceptives due to health risks, breastfeeding, or personal preference. The implant is effective for up to five years, though it can be removed earlier if pregnancy is desired.
More from this site
Keep reading the latest coverage
Benefits of Choosing a Progesterone-Only Method Like Nexplanon
One major benefit is long-term, reversible contraception without daily attention. Unlike pills that require consistent timing, Nexplanon provides continuous hormone release once inserted, reducing user error. Progesterone-only methods are also suitable during breastfeeding, as they generally do not affect milk supply. Other benefits include reduced menstrual bleeding or amenorrhea for some users, lower risk of certain reproductive cancers, and no estrogen-related side effects such as blood clot risk in susceptible individuals. The implant offers privacy, as it is not visible once placed.
Effectiveness and How Nexplanon Compares to Other Progesterone-Only Methods
Nexplanon is among the most effective forms of reversible contraception, with a failure rate of less than 1 percent with typical use. Other progesterone-only methods include the mini-pill, Depo-Provera injection, and hormonal IUDs like Mirena and Kyleena. The mini-pill requires daily intake and has higher typical-use failure rates than the implant. Depo-Provera is an injection given every three months and may cause bone density loss with extended use. Hormonal IUDs are also long-acting but require a pelvic procedure for placement. Nexplanon's arm placement is less invasive than an IUD, though both are categorized as long-acting reversible contraception, or LARC.
Side Effects and Health Considerations
Common side effects include irregular bleeding, headache, breast tenderness, and changes in mood. Some users experience amenorrhea, while others have unpredictable spotting, especially during the first six to twelve months. Progesterone-only methods do not protect against sexually transmitted infections. Condom use is recommended for STI prevention. Insertion can cause temporary discomfort or bruising at the site. Rare complications include infection, nerve damage, or migration of the implant, which requires surgical removal. Those with liver disease or certain cancers may not be candidates. Discuss medical history with a provider before use.
Who Should Consider Nexplanon
People seeking a low-maintenance, highly effective, long-term option may consider this method, especially if estrogen-containing contraceptives are not advised due to migraines with aura, history of blood clots, or breastfeeding status. It suits those who prefer not to think about birth control daily or prefer not to use barrier methods consistently. It may not be ideal for those with irregular bleeding concerns unless managed with medical support. A patient-centered approach helps weigh individual risk factors and lifestyle needs.