greater than 99% effective when taken as directed
DO NOT TAKE DEPO......i am a true activist for not taking this shot....there is simply something very unatural about a woman not having a period every month. it is effective at preventing pregnancies. i was on it as a adolescent, due to my mother making me and i having no choice in not taking it, during the years of getting this shot i actually had two months of a period and one month w/o it between every shot, which is administered once every three months, i am not saying that this will also happen in every woman however it has been recorded that this happens more often than not in woman on the shot. not too mention once you are ready to have children this particular shot will prevent pregnancy for month or even years after stopping. please do as much research on your own as possible prior to taking this particular drug.