Hi i'm a young mother of 3... I've been using IMPLANON since 2006...
It can last for about 3 years depending on the person's body mass.
So far I've never had any side effects; beside the minor headache once in a blue moon.
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Implanon® is a long-acting reversible contraceptive. It is shaped like a tiny rod which is inserted just under the skin at the inside of your upper arm.
Implanon® is applied subdermally in the middle of the upper arm.

Benefits of Implanon®:

    * You are protected from pregnancy for up to 3 years     
      No daily action is required
    * Implanon® doesn’t interfere with your sex life
    * Your pre-existing fertility returns quickly after the removal of Implanon®
    * Its quick and easy to insert and remove

Who can use Implanon®?
  Women who:

    * want an easy to use method that, once in place, does not require any action by them
    * want an alternative to sterilisation
    * want to space their children
    * want to delay having children
    * are not or no longer satisfied with their current method of contraception
    * cannot tolerate or are contraindicated to synthetic oestrogen
    * want a tolerable, effective, easily reversible method of contraception

Who can't use Implanon®?
  Women who have:

    * active thromboembolic disorders
    * progestogen dependent tumours (known or suspected)
    * presence or history of severe hepatic disease as long as liver function values have not returned to normal
    * benign or malignant liver tumours
    * known or suspected carcinoma of the breast
    * known or suspected pregnancy
    * undiagnosed vaginal bleeding
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THE ABOVE WAS TAKEN FROM HERE