Effectiveness in Preventing Pregnancy
- Of 100 women who use this method each year, about 1 would get pregnant
- The risk is smallest in women who use the shot correctly (getting it on time)
- Each shot is effective against pregnancy for about 12 weeks
Clinic Visit Required
- Yes, only a health care provider can give a woman the birth control shot
How effective is it?
Of 100 women who use this method correctly each year (getting the shots on time every 12 weeks), about one woman is likely to get pregnant.
The shot may also not work as well for women who take certain medicines or the supplement St. John's Wort. Talk with your health care provider if you have any questions about the birth control shot.
Advantages of the birth control sho
- The shot does not require the consent of the female's partner
- The shot is safe and works well in preventing pregnancy. Using the shot means you do not have to think about birth control when you want to have sex
- Many women who use the birth control shot have lighter periods (or no periods at all) and fewer cramps
- Women who take the shot are less likely to have cancer of the uterus and pelvic inflammatory disease (PID)
Drawbacks of the birth control shot
- Does not protect against sexually transmitted infections (STIs)
- Requires a clinic visit every 12 weeks
- It may take up to a year after stopping the shot to become pregnant
- Some women experience side effects such as breast tenderness, spotting or bleeding between periods, weight gain, and headaches
- Using the shot longer than two years may cause thinning of a woman's bones, and this can worsen the longer she uses the shot. However, normal bone growth returns when a woman stops taking the birth control shot