Injectable Contraceptives (Depo-Provera)

An injection of progestogen which releases very slowly into the body. This works by stopping the release of an egg (ovulation) and by thickening of the cervical mucus to prevent sperm meeting an egg.

Advantages

• Very effective method - over 99%.
• An injection (of Depo-Provera) lasts for 12 weeks, so may be preferred by those who have difficulty in remembering to take pills.
• May protect against cancer of the lining of the womb.
• Some protection from pelvic inflammatory disease.

Disadvantages

• Periods become irregular or stop (some may consider this a positive aspect!)
• Regular periods and/or fertility may take a year or more to return once the injections are stopped.
• Some women gain weight.
• Some experience other possible side effects such as headaches, tender breasts, acne, mood swings and bloating.
• Once given it can not be removed and so it there are any side effects they may continue for some time.
• Involves an injection.
• May lead to a decrease in bone density.