Implanon doesn't offer protection from sexually transmitted infections (STIs).

Less than 1 out of 100 women who use Implanon for one year will get pregnant. If you do conceive while using Implanon, there's a higher chance that the pregnancy will be ectopic — when the fertilized egg implants outside the uterus, usually in a fallopian tube.

Side effects associated with Implanon include:

  • Abdominal or back pain
  • Acne
  • An increased risk of noncancerous ovarian cysts
  • Changes in vaginal bleeding patterns, including absence of menstruation (amenorrhea) — although irregular bleeding may lessen within three to nine months
  • Decreased sex drive
  • Dizziness
  • Hair loss
  • Headaches
  • Mild insulin resistance
  • Mood swings and depression
  • Nausea or upset stomach
  • Potential interaction with other medications
  • Sore breasts
  • Vaginal inflammation or dryness
  • Viral infections
  • Weight gain
Jan. 21, 2012