Medroxyprogesterone
"Very effective but bad side effects. I'm 17 and I've had two doses of it but I won't be continuing it. I have gained weight that is IMPOSSIBLE to lose, I get head rushes and I feel dizzy almost every time I stand up and lots of cramping. I stopped getting my period but one every month-two months I have a few drops of blood but that's it. I'm not happy with the shot but it was effective."