"i&#039;ve had two implanon&#039;s in four years. with the first one i gained around 20kgs, obviously not from the implanon itself but more likely as a result of a massive hormone change. i had the first one for almost three years before i decided to have it removed as it caused such a profound hormone imbalance i ended up with a harmless but embarrassing discharge for the last nine months. 
the second implanon i had implanted in early 2015, it started off fine- one menstrual cycle every 2-3 months, but now i am lightly bleeding for two weeks of every month with terrible hormonal acne and cramps. 
this device has been a wonderful thing for me most of the time so i allow it a bit of leeway in terms of unwanted effects."