What Is An IUS? Get To Know This Hormonal Contraceptive Device

June 30, 2021 | Written By: Lutfi Yunus

Intrauterine system (IUS)

What Is An IUS?

An intrauterine system (IUS) is a small, T-shaped plastic device that is inserted into the womb by a specially trained doctor or nurse

How Does An IUS work?

An IUS contains progestogen and slowly releases it into the womb. The progestogen in the womb causes the mucus from the cervix to thicken, creating a condition that is hard for sperm to enter the uterus and fertilize the egg. The womb lining will also become thinner, thus prohibiting the attachment of a fertilized egg to the womb. Fitting this device may also stop ovulation (release of the egg) in some women. 

An IUS may affect periods by causing irregular bleeding or spotting, especially in the first 6 months. In some women, their periods may become lighter than usual or may continue to be irregular or stop altogether. However, these conditions are normal and not harmful. 

Consult your doctor or nurse at any time if you have any problems or questions about using an IUS. 


How Effective Is An IUS?

Similar to an intrauterine device (IUD), the IUS is also a very effective, long-acting reversible contraceptive (LARC) method.

It works for 3–5 years, depending on the type. It can be fitted in non-pregnant women at any time in the menstrual cycle. Protection against pregnancy is immediate if it is fitted in the first 7 days of the menstrual cycle, while additional contraception may be required if it is fitted at any other time. 

Ask your healthcare provider if you want to know if the IUS is suitable for you.


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