What is an Intra-Uterine Device?
An Intra-Uterine Device (IUD) also known as the 'coil' is a small plastic and copper device which is inserted into the uterus. It prevents sperm from surviving in the uterus and makes it difficult for sperm to get through cervical mucus. It may also work by stopping a fertilised egg cell from implanting in the uterus. It is around 99% effective.
What are the advantages?
- It works as soon as it is inserted
- It works between 3 and 10 years depending on the type of IUD
- It can be removed at any time and normal fertility levels will return immediately
- It does not involve hormones
- It does not interrupt sex
- You don't have to think about contraception for as long as the IUD works
What are the disadvantages?
- Periods may be heavier or longer and more painful
- Possibility of the IUD moving or being pushed out of the uterus. The doctor or nurse will teach how to check your IUD threads every month to make sure it is still in place
- On rare occasions, the IUD can perforate the uterus or cervix when it is fitted. If this happens the IUD may have to be surgically removed
- It does not protect you against STIs