<prompt> Replacement of etonogestrel implantImplanon is normally done after how many years?2 years3 years4 years5 years  <response>: Implanon is a single rod subdermal implant with 68 mg of the progestin etonogestrel ENG, and an ethylene vinyl acetate copolymer cover. It can be used as contraception for 3 years and then replaced at the same site or opposite arm. It is placed in the medial surface of the upper arm 6 to 8 cm from the elbow in the biceps groove within 5 days of onset of menses. Prolonged and frequent bleeding is the most common adverse effect. Ref: Cunningham F.G., Leveno K.J., Bloom S.L., Hauth J.C., Rouse D.J., Spong C.Y. 2010. Chapter 32. Contraception. 