Contraceptive implants
Implanon® Implanon NXT® are contraceptive implants that slowly releases the hormone progestogen into the body over a period of 3 years. IT works in 2 ways:
- it stops the body releasing an egg each month
- it makes the mucous in the cervix thicker so sperm cannot get through.
It is a small plastic rod, about the size of a matchstick, which contains a progesterone hormone. The rod is inserted just under the skin on the inside of the upper arm. It is very flexible and hard to see once in place.
The implant is inserted by a doctor or health service. A local anaesthetic is given to make the area numb before the implant is inserted.
Things to consider
- It is a ‘fit and forget’ method meaning. Once it is in place, it lasts up to 3 years.
- It is effective as soon as it is in place.
- It does not contain oestrogen and may be safer for some people, including smokers.
- Body weight, stomach upsets or medications do not reduce its effectiveness.
- It can be removed, with fertility returning after a month for most people.
- Many people have very light periods or may completely stop having periods.
- It is not suitable for people who may be pregnant, have liver disease or extremely heavy menstrual bleeding.
- It may cause side effects such as irregular bleeding painful periods, nausea or mood swings. If this happens, see your doctor.
- The initial cost is high, but it is not expensive when averaged over 3 years.
- Implanon can be used while breastfeeding (but check with your doctor first).
- Does not protect against STIs.
Last reviewed: 28-10-2024
Acknowledgements
Sexual Health and Blood-borne Virus Program, Public Health
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