A hormone is injected that prevents the ovaries from releasing eggs. It also thickens the cervical mucus, which also keeps sperm from joining with an egg.

How Well Does it Work?

Depo-Provera is one of the most effective, reversible contraceptives. If administered correctly, the effectiveness rate is 99.997%. Depo-Provera does not offer any protection against STDs.

What are the Advantages?

Convenient
Each dose prevents pregnancy for 12 weeks
Reduces menstrual cramps
Offers protection against ovarian cysts
Offers protection against endometrial cancer
Does not need to be taken daily

Who Should Not Use Depo-Provera?

Women who may try to get pregnant within a year
Women who cannot put up with irregular bleeding
Women who have serious liver disease

What Are Some Common Side Effects?

Irregular intervals between periods
Longer menstrual flow
Spotting between periods
No bleeding for months at a time

Less common side effects include weight gain, sore breasts, headache, depression, dizziness, skin rashes, vaginal dryness and an increase or decrease in sex drive.

Go back to the Contraceptive Information Main Page