What the packet says
What is Noristerat?
What's it made of?
Noristerat is a white sterile liquid. Each dose contains the hormone Progesterone in a solution that contains benzyl benzoate (which may increase the risk of jaundice in newborn babies) and castor oil, to help with the injection.
How Noristerat works
The contraceptive injection is injected into your body every 2-3 months and steadily releases the hormone progestogen into your bloodstream. It prevents 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 an embryo to grow in it.