What is it and how does it work?

Progestrogen hormone injections stop ovulation; thicken cervical mucus to stop sperm reaching the egg; and thin the lining of the womb to prevent a fertilised egg from implanting. 


Up to 99% effective

Who can have it?

Women of child bearing age, depending on consultation.


Lasts for up to  14 weeks. For as long as the injection lasts, you don’t need to think about contraception to prevent pregnancy. Can help reduce heavy painful periods. 


Your periods may change (stop, last longer or become irregular). Can take up to a year for your fertility to return. Can cause some women to put on weight. 

Risks/Side effects

The Injection is not affected by other medicines. Once given the Injection cannot be removed. 

Further guidance