What is it?

Contraceptive injections release the hormone progestogen (Depo-Provera, Sayana Press) into your bloodstream to prevent pregnancy. The progestogen hormone thickens the cervical mucus, which makes it difficult for sperm to move through the cervix, and thins the lining of the womb so a fertilised egg is less likely to implant itself.

Depending on the type used, the injections last for 12 weeks and are given in the buttock. This form of contraception is 99% effective, if used correctly.

To compare contraception methods and what will work best for you, use the Contraception Choices Tool 

The injection is a good option for many women, however may not be suitable if you:

  • Think you might be pregnant 

  • Want to keep having regular period 

  • Have inconsistent bleeding between periods

  • Have previously had breast cancer

  • have arterial disease or a history of heart disease or stroke

  • have liver disease

  • Have cirrhosis or liver tumours.

  • Are at risk of osteoporosis.

  • Injections last for 12 weeks

  • it does not interrupt sex

  • it's an option if you can't use oestrogen-based contraception (such as the combined pill, vaginal ring, or contraceptive patch)

  • Good alternative if you are not good at remembering to take a pill everyday

  • it's safe to use while you're breastfeeding

  • it's not affected by other medicines

  • it may reduce heavy, painful periods and help with premenstrual symptoms for some women

  • some people may put on weight when they use Depo-Provera or Sayana Press contraceptive injections

  • You may experience side effects such as acne, tender breasts, changes in mood and loss of sex drive however these may be temporary

  • your periods may change and become irregular, heavier, shorter, lighter or stop altogether – this can carry on for some months after you stop the injections

  • There is a small risk of infection at the site of injection. In very rare cases, some people might have an allergic reaction to the injection.

  • It may take a while for your fertility to return to normal. Sometimes it can take up to a year to get pregnant after stopping the injection.

  • Thinning of the bones may be a problem for those who already have increased risk of developing osteoporosis. Speak to your clinician if you think you may be at risk.

Make an appointment at one of our clinics to speak with a nurse or clinician to talk through your options and best suitable method of contraception for you.