The contraceptive injection contains the hormone progestogen. It prevents pregnancy by stopping the ovaries releasing an egg (ovulation). The contraceptive injection is more than 99% effective if used correctly. If you get your injection late, it’s less effective. It lasts for 8 to 13 weeks, depending on the type. The types of contraceptive injection used in the UK include Depo Provera, Sayana Press and Noristerat. When you stop getting the contraceptive injection, it can take up to 1 year for your fertility to return to previous levels.

Common side effects of the contraceptive injection include changes to your periods, such as periods stopping, being irregular or lasting longer – the longer you use it the more likely it is that your periods will stop completely; putting on weight; and pain, a small lump or a scar where the injection is done

Some people report acne, lower sex drive, mood changes, hot flushes and headaches. 

You can find out more about the contraceptive injection here

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