ImplanonBy Mayo Clinic staff
Original Article: http://www.mayoclinic.com/health/medical/IM04280
Implanon is a contraceptive implant that's placed under the skin of the upper arm. Implanon releases a low, steady dose of a progestational hormone to thicken cervical mucus and thin the lining of the uterus (endometrium). Implanon typically suppresses ovulation as well.