How does the contraceptive coil work?

How does the contraceptive coil work?

Contraceptive coil
Contraceptive coil
IUD stands for intrauterine device. An IUD is a small coil which is inserted into the uterus to prevent pregnancy. There are two different types of coil, the copper coil and the hormone coil. Both provide effective contraceptive cover and are very convenient. Find out how they work and whether a coil is the right contraceptive for you.

Last reviewed: 2/11/2019 by Dr Simran Deo

Advantages and disadvantages of the coil


  • With the coil you don’t need to remember to take tablets. 

  • You can continue using the coil for several years.

  • The coil is not affected by any medication and remains effective when you are ill or taking antibiotics.

  • Once you remove it you are fertile again.


  • You still need to use a condom for protection against STIs.

  • You may experience heavier or more painful periods (this does not apply to the Mirena coil).