"i have been on this product for 2 years now. its very very effective. it is the only form of birth control i&#039;ve used for two years and no babies. the downfalls are: mood swings a week before period begins (unreasonably sad with no reasons whatsoever), irregular bleeding (no idea when it will come,  brown at beginning then heavy), long lasting periods (like a month), and when it was inserted my doctor hit a vital nerve causing me to faint. ever since the implanted area has nerve damage and can cause my arm to go numb if i hold it in a certain position. i can also feel my nerve damage whenever i&#039;m on my period (maybe the hormone interacting with my nerves)."