Methods of Contraception – Intrauterine system (IUS)

The Mirena is the most common IUS, otherwise known as a coil that is fitted into the uterus (womb). It is a small, T-shaped plastic device which acts locally inside the uterus by releasing a very low dose of progestogen hormone to prevent pregnancy by altering the lining of the womb and cervical mucus. In some women ovulation (releasing of an egg) is also prevented. This intrauterine system can be left in place for up to five years depending on the type. If fitted correctly, the IUS is over 99% effective and many women find it very good as they have few periods or very light periods. The failure rate is extremely low and there are very few people who are not suitable for this method of contraception.

This method of contraception is a form of long-acting reversible contraception (LARC) which works for three to five years without having to think about contraception every day or every time you have sex. Also, for women aged 45 and over, an IUS can be fitted and left in until you reach menopause or you no longer need contraception and it may help relieve some menopausal symptoms.

Learn more about intrauterine system.

Remember, this method of contraception is only effective in preventing pregnancy, to protect yourself against STIs and BBVs, condoms should also be used, which can be accessed for free via the Lanarkshire C Card Scheme.