Depo-Provera (medroxyprogesterone acetate) is a drug very similar to progesterone, a hormone normally produced by the ovaries every month as part of the menstrual cycle. Depo-Provera is an injectable medicine that prevents pregnancy for up to 3 months with each injection ("shot").

 

How does it work?

Depo-Provera prevents pregnancy by preventing ovulation (the release of an egg from the ovary). If an egg is not released, pregnancy is unlikely. Depo-Provera is given as 1 shot in the buttock or upper arm. The first shot should be given within 5 days after the beginning of a normal menstrual period, and shots should be repeated every 3 months.

 

Is it effective?

Depo-Provera is as effective as tubal ligation (having your tubes tied) and more effective at preventing pregnancy than several other methods, including birth control pills, condoms and diaphragms. It does not, however, protect against AIDS or any other sexually transmitted diseases.

 

Is the effect permanent?

No. Depo-Provera only works for about 3 months. The shot must be repeated every 3 months to prevent pregnancy. After a woman stops using Depo-Provera, her normal ovarian function returns after a short time. However, it takes an average of 9 to 10 months to get pregnant after getting the last shot.