abnormal uterine bleeding
"My experience is definitely not common, but after my first shot, I bled for 7 days (shortest and lightest period I've ever had) and I haven't had a period since. I tried this after a nightmarish experience of months of nonstop bleeding and cramping on the pill. My periods were usually ridiculously heavy and lasted for an average of 11 days (why I started birth control in the first place) and depo has given me a normal/gone period for the first time ever. I love it."