How does the implantable contraceptive(implanon) work in the body?

Several ways: It stops an egg from being released. It thins the lining of the uterus making it hard for an egg to implant. It thickens the cervical mucus making it harder for sperm to move. It stops the fallopian tube from pushing the egg forward.

Progesterone implant: Implanon is a small, rod shaped implant that is placed just under the skin on the inside of your upper arm. It continuously releases progesterone, which prevents ovulation and renders the endometrium less favorable for implantation. It provides contraception for 3 years. Implanon is considered a top tier contraceptive method (most effective) comparable to an iud or even permanent sterilization.