"i&#039;ve been on depo since i was 18, i&#039;m now 23. i&quot;ve had no side effects, thankfully. it&#039;s really just hit or miss, you wont know until you give it a try. only complaint i have is my arm is really sore the first day &amp; sometime through the second day after you get the shot. if you do choose to use this form of birth control find out your recommended dose of vitamin c &amp; d, you definitely need these vitamins while taking this drug! i get my shot every 3 months at plan parenthood &amp; pay out of pocket $125, so it&#039;s about $40/mo? not too bad! i&#039;ve never became pregnant while using depo &amp; i only have spotting during the two weeks my depo is due so about once every 3 mo."