What the packet says
What is Noristerat?
What's it made of?
Noristerat is a white sterile liquid. Each dose contains the hormone norethisterone which is a progestogen, in a solution that contains benzyl benzoate and castor oil.
How Noristerat works
The contraceptive injection contains progestogen and is injected into your body every 2 to 3 months. It works to prevent pregnancy in three ways – by stopping ovulation, making the fluid in your cervix thicker (which makes it more difficult for sperm to enter the womb), and preventing the lining of your womb thickening enough for a fertilised egg to implant in it.