Etonogestrel
"This is my fifth year using the Implanon (second implant) and I'm unsure whether I will have another put in when this one is removed. Due to family history with thrombosis I was advised by my GP against using other methods due to a high risk of blood clotting. He advised me to use the Implanon as this is widely recognized as one of the most effective birth control methods. I have to say that even with it's disadvantages I agree. I have gained roughly 3 and half stone since using Implanon which I am very unhappy about and have tried numerous ways to lose (I even purchased a treadmill for home use and it has had little effect)! I also have unbelievable mood swings and cry at the most ridiculous things! But it does work."