Chapter 9
CHAPTER 9 - Implants
What Are Implants?
- Implants are small plastic rods, each about the size of a matchstick, that release a progestin like the natural hormone progesterone in a woman’s body.
- A specifically trained provider performs a minor surgical procedure to place 1 or 2 rods under the skin on the inside of a woman’s upper arm.
- They do not contain estrogen, and so can be used throughout breastfeeding and by women who cannot use methods containing estrogen.
- Types of implants:
- Jadelle: 2 rods containing levonorgestrel (LNG), highly effective for 5 years
- Implanon NXT (also known as Nexplanon; replaces Implanon): 1 rod containing etonogestrel (ETG), labeled for up to 3 years of use (a recent study shows it may be highly effective for 5 years). Implanon NXT can be seen on X-ray and has an improved insertion device.
- Levoplant (Sino-Implant (II)): 2 rods containing LNG, labeled for up to 3 years of use
- Norplant: It consisted of 6 capsules and was effective for 5-7 years, but was discontinued in 2008 and is no longer available for insertion. A small number of women, however, may still need Norplant capsules removed.
- Implants work primarily by:
- Preventing the release of eggs from the ovaries (ovulation)
- Thickening cervical mucus (this blocks sperm from reaching an egg