Injectable contraceptives

This is a hormonal method of contraception which is given by injection either once every 2 months or once every 3 months. The hormone, which is a progestogen, is released very slowly into the body. The effect is to prevent an egg being released from the ovary and to thicken mucus around the neck of the womb making it difficult for sperm to enter. In some women, injections may also prevent ovulation.

The injections are given by your doctor, nurse or family-planning clinic, so you have to remember to attend your appointment. Once you have had the injection, you don't have to think about contraception for a while. Some women find that their periods become irregular on this method, or stop altogether and some women put on weight. When you stop the injections, regular periods and fertility may take up to a year to return.

How effective are injectable contraceptives compared to other methods