"very effective but bad side effects. i&#039;m 17 and i&#039;ve had two doses of it but i won&#039;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&#039;s it. i&#039;m not happy with the shot but it was effective."