Final answer:
The Implanon implant is effective for up to 3 years for birth control.
Step-by-step explanation:
The Implanon implant is a matchstick-size, flexible rod that is inserted under the skin of the upper arm. It releases the hormone progestin, which brings about changes in the uterus lining and cervical mucus to prevent sperm from reaching an egg. In some cases, it can also prevent the ovaries from releasing eggs. The Implanon is effective for a duration of 3 years after which it needs to be replaced if continued birth control is desired.