"this is my fifth year using the implanon (second implant) and i&#039;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&#039;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."