Mechanism

The Intra-uterine system works by releasing progesterone and preventing implantation.

Life span

It works for 5 years, in which periods become lighter. When removed, fertility returns to normal.

Features of the IUS

• Irregular bleeding or spotting is common in the first 6 months, periods may stop altogether. There is a small risk of infection during first 20 days after insertion. The patient may get ovarian cysts.
• If fitted after 45, it can stay in place until menopause. Women are also taught to check the IUS is in place.
• It is useful for women who experience heavy or painful periods.