Needle-phobes beware! With Depo-provera treatment, you will get an injection in the rear end every three months with a needle that releases a hormone similar to progesterone. This hormone keeps your ovaries from releasing eggs, so it's basically impossible to get pregnant. Yes, they hurt, but here's the good news: most women on Depo-Provera no longer have their periods. So burn those bulky pads and buy some condoms with the money you'll save on tampons. Each shot costs about $40.

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