Intrauterine system

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An IUS is a contraceptive device that releases the female hormone progestogen into the body. It is similar in shape to an intrauterine device (IUD), which releases copper into the body to prevent pregnancy.

The IUS is proven to be over 99% effective in preventing pregnancy and will begin to work as soon as it is fitted.

A GP, Family Planning Clinic or Sexual Health Clinic doctor fits an IUS usually during, or just after, the menstrual period.

What is it used for?
How does it work?
Who can use it?
Advantages
Disadvantages