ABSTRACT
They are excellent examples of long-acting reversible contraceptives (LARCs), with the ideal ‘forgettable’ default state, yet rapid reversibility.
Mechanism of action, administration and effectiveness Implanon works primarily by ovulation inhibition, supplemented mainly by the usual sperm-blocking mucus effect. It is a single 40 mm rod, just 2 mm in diameter, containing 68 mg of etonogestrel – the chief active metabolite of desogestrel – and so has much in common with Cerazette. This is dispersed in an EVA matrix and covered by a 0.06 mm rate-limiting EVA membrane.
