Over 99% effective once the injection is given regularly
The injection contains the female hormone progestogen. An injection is given by a health care professional approximately every 12 weeks.
How it Works
The hormone progestogen is released very slowly into the body to prevent ovulation (an egg being released).
- Does not interrupt sex
- May protect against cancer of the womb
- Useful for women who forget to take their pill daily
- Can be used by women who cannot take oestrogen in the combined oral contraceptive pill, such as women over 35 who smoke
- May cause irregular bleeding
- Injection must be given by a doctor or a nurse
- Cannot be immediately reversed in the event of side effects
- Can take time for regular periods and fertility to return to normal
- Does not protect against sexually transmitted infections