"i started taking the depo shot when i was 17, however it did help effectively with me not getting pregnant, and i did not have any periods for four years, but it caused me to have crazy mood swings, insane depression, and made me feel down all the time. i switched to the birth control pill now that i&#039;m 20 and i don&#039;t feel like i&#039;m going completely crazy now! so i do not recommend this birth control at all!"