amenorrhea
"I had the worst experience on this medication. First, I recieved 2 shots. Secondly, I was on my period for 3 entire months, non-stop, heavy bleeding. Third, I gained roughly 25 pounds on the shot. Thankfully, I have changed birth controls and have been off the shot now for over a year, but as soon as I stopped the injections, the weight melted off without any change in diet or exersise."