Contraceptive Injection

The contraceptive injection protects against pregnancy for eight weeks or 12 weeks depending on the type of injection you use.
The injection contains progestogen, which thickens the mucus in the cervix and stops sperm reaching the egg. It also thickens the lining of the womb preventing an egg implanting in the womb and therefore preventing a pregnancy.
If used correctly it is 99% effective.
Because of the length that the injection lasts it means that you don't have to think about contraception everyday. It can also be a good option for women who cannot use contraception that contains oestrogen.
The down side to having the injection is that if you do have any side effects from the injection such as irregular bleeding these cannot be reversed and will persist for the length of the injection.
Using condoms as well as the injection is the only way to protect against STIs.
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