Implanon (etonogestrel) has been replaced by Nexplanon. The new version of the contraceptive implant is bioequivalent to Implanon and is removed in the same way. However, it contains barium to allow localisation on X-ray or CT scan.
Nexplanon also has a different insertion mechanism from Implanon, designed to reduce implantation errors. Healthcare professionals trained in the use of Implanon must be trained in the new procedure (preferably including model-arm training with a placebo implant) before starting to insert Nexplanon.
Further information: www.nexplanon.co.uk/training