Effective
IMPLANON™ is more than 99% effective: the chance of getting pregnant is less than 1 pregnancy per 100 women who use IMPLANON™ for 1 year when IMPLANON™ is inserted correctly. IMPLANON™ prevents pregnancy in several ways. The most important way is by stopping release of an egg from your ovary. IMPLANON™ also thickens the cervical mucus, which acts as a barrier to prevent sperm from fertilizing an egg.
It is not known if IMPLANON™ is as effective in very overweight women because clinical studies did not include many overweight women. Certain medicines may make IMPLANON™ less effective, and you may also need to use a barrier method of contraception while you are using these medicines.
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