Anterior view of injection therapy birth control (depo-provera). Injection therapy is a female hormonal contraceptive method that is delivered via an injection into the buttocks or arm every three months; hormones stop the ovary from releasing an egg, so that pregnancy does not occur. The hormones also cause the cervical mucous to thicken, making it more difficult for sperm to enter the uterus, and change the lining of the uterus, preventing implantation of a fertilized egg. Injection therapy birth control can only be administered by a physician. It has a failure rate of less than 1%, and offers no protection against STDs.

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