"i have to rate this a 5/10 because on one hand it is really effective. my husband and i use no form of backup contraceptives (i.e condoms) and have not fallen pregnant. i also rarely have periods, and when i do they are fairly light. however, on the other hand i have been on the implant for 1 year and 8 months, and have gained so much weight. i have gained upwards of 30 pounds, and i have been trying to figure out why. my eating/fitness habits have not changed one bit since i got the implanon inserted, so it is quite obviously due to the implanon which seems to be a common complaint. i also have zero sex drive, bad mood swings, and periods of extreme lethargy. i am often too tired to do anything. i have an appointment for removal next week."