Depot Provera is a hormonal injection, or shot, which prevents pregnancy. A single shot works for up to 90 days. These injections are given into the muscles of the upper arm or buttocks. The hormone in Depot Provera is a progestin. It contains no estrogen.
Side effects that may occur include:
- Changes in menstrual cycles or extra bleeding or spotting. Around half of women who use these injections have no menstrual cycles
- Breast tenderness, weight gain, headaches, or depression
Progestin injections work better than birth control pills to prevent pregnancy. In any 1 year, only 1 out of 100 women who uses progestin injections is likely to get pregnant.
Sometimes the effects of these hormone shots last longer than 90 days. If you are planning to become pregnant in the near future, you might want to consider a different birth control method.