Depo Provera is a hormone used for contraception. It is given by injection and its effects will last for three months at a time. It is similar to progesterone, which is one of the two main hormones made by a woman's ovaries during her normal cycles.
Why use contraception?
|Contraception is necessary if you wish to avoid an unintended pregnancy.|
|Every month a woman's ovary produces an egg. When a man ejaculates, his semen contains millions of sperm. It takes only one of these sperm to fertilise an egg and begin a pregnancy. If a couple has sex and do not take precautions, there is a high risk of pregnancy. Using contraception allows you to have sex and avoid an unintended pregnancy.|
A condom is always a good idea
|In Australia, there are more than 20,000 new sexually transmitted disease infections every year. One of the most common of these is chlamydia, which can lead to infertility if left untreated. A condom is your best protection against infections. If you use a condom and water-based lubricant every time you have sex you will have less chance of getting HIV/AIDS and many other sexually transmitted infections (STIs).|
How does Depo Provera work?
|When a woman has Depo Provera, her body senses the presence of the hormone so that her own hormone production is 'switched off'. Because of this, her ovaries will not release an egg and this is how pregnancy is prevented. This is very similar to how 'the Pill' works. Depo Provera is also sometimes used in the treatment of endometriosis.|
How well does it work?
|Depo Provera is a highly effective method of contraception when it is given every 3 months (99.8% effective). In real life about 1 in 20 women (94%) will get pregnant when using Depo Provera.|
|Because hormone levels are low, most women develop very little uterine lining and have reduced periods. After two to three injections, many women will have no periods at all because there is no lining building up to shed. Some women will have nuisance bleeding, which is usually light and irregular. Occasionally a woman will have troublesome heavy bleeding, which can usually be controlled by hormone treatment.|
- A small amount of weight gain sometimes occurs, although many women have no change and some lose weight.
- Some women may be troubled by headaches, abdominal discomfort and mood changes.
- Some women have a reduced interest in sex, particularly women who are prone to depression.
- A small minority of women experience other side effects, which may be a nuisance but are unlikely to be serious. These include allergic reactions, fluid retention and breast soreness.
Advantages of Depo Provera
- Depo Provera is highly effective with a very low failure rate.
- For many women the loss of periods is an advantage with relief of symptoms such as premenstrual tension and period pain.
- Depo Provera is also likely to cause some reduction in risk of ovarian cancer, endometrial (uterine) cancer, endometriosis and possibly pelvic infection.
- An injection is given every 12 weeks and no other effort or remembering is required.
Disadvantages of Depo Provera
- Some women do not wish to see their doctor every three months for an injection.
- Some women experience side effects as already described, which may be uncomfortable or unpleasant.
- Once the injection has been given, the hormone cannot be removed. If a woman wants to stop the Depo Provera she has to wait for it to wear off. In some women, periods can be slow to return after the injections are stopped; sometimes it takes up to 6 or 12 months. However, more than half will fall pregnant within 12 months and over 90 percent within two years.
Other things to think about
|Hormone levels are very low while using Depo Provera, so there is some concern that this may lead to some thinning of the bones (osteoporosis) in women who use Depo Provera for a long period of time. The importance of this is not yet known, but the changes would be expected to happen more slowly than those that occur normally after menopause and reverse after the injections are ceased.|
Women commonly worry about drugs of any kind and cancer. Although it is extremely difficult to prove a complete lack of risk, Depo Provera has not been shown to have any effect on the risk of breast cancer. It should be noted that protective effects against cancer of the ovary and uterine lining are very likely. No ill effects on the developing baby have been shown to occur if Depo Provera is given when a woman is already pregnant or in the very rare case where a woman becomes pregnant despite the injection.
Who can use Depo Provera?
|Depo Provera can be used by most women who do not have any serious medical problems and by many women who use other forms of contraception. It may also be suitable for women who cannot take the combined pill for medical reasons.|
Who should not use Depo Provera?
|Depo Provera is not suitable for women who are experiencing the following:|
- bleeding disorders or taking anticoagulant medication
- undiagnosed abnormal bleeding
- history of some forms of cancer
- certain other serious medical problems
- wanting to become pregnant within 12 months.
Where to get more information
|Women's Health Information Centre|
|Ground floor, near main entrance|
Royal Women’s Hospital
Tel: (03) 8345 3045 or 1800 442 007 (rural callers)
|Choices Clinic at the Women's|
|A low cost service offering advice, consultation and treatment for all contraceptive and sexual health requirements.|
Hours: Tuesday, Wednesday, Thursday and Friday mornings
Location: Level 1 South, Royal Women's Hospital
Tel: (03) 8345 3032 to make an appointment.
Visit the For more information visit Choices Clinic service information page for more information.
Related fact sheets
|The Royal Women’s Hospital does not accept any liability to any person for the information or advice (or use of such information or advice) which is provided in this fact sheet or incorporated into it by reference. We provide this information on the understanding that all persons accessing it take responsibility for assessing its relevance and accuracy. Women are encouraged to discuss their health needs with a health practitioner. If you have concerns about your health, you should seek advice from your health care provider or if you require urgent care you should go to the nearest Emergency Dept.|
|Last updated October 2013|