What is the difference?

Hormonal IUD vs Copper IUD

Both are small T-shaped devices fitted in the uterus and both are often just called "the coil", so people are not always sure which one they have or want. The main difference is that the hormonal IUD releases a progestogen, while the copper IUD contains no hormones at all.

General information, not medical advice. For advice about your own situation, talk to a clinician, pharmacist or sexual health clinic.

Contraception

Hormonal IUD

A hormonal IUD is a small T-shaped device placed in the uterus that releases a progestogen and prevents pregnancy for three to eight years depending on the type.

Full entry
Contraception

Copper IUD

A copper IUD is a small T-shaped device with copper that is placed in the uterus and prevents pregnancy without hormones for five to ten years.

Full entry

Side by side

Hormonal IUDCopper IUD
Active ingredientHormonal IUDReleases a progestogen hormone.Copper IUDCopper, with no hormones.
How it worksHormonal IUDMainly thickens cervical mucus and thins the lining of the uterus.Copper IUDCopper makes the uterus a hostile environment for sperm and eggs, stopping fertilisation.
How long it lastsHormonal IUDAbout three to eight years, depending on the type.Copper IUDAbout five to ten years.
Effect on periodsHormonal IUDOften lighter, and for some people they stop.Copper IUDMay become heavier, longer or more painful, especially at first.
Other usesHormonal IUDSome types are also prescribed for heavy periods.Copper IUDThe most effective emergency contraception when fitted within five days of unprotected sex.

In short

Choose between them mainly on hormones and periods: the hormonal IUD tends to lighten periods, the copper IUD is hormone-free but can make them heavier. A clinician can help weigh the options.

What they have in common

Both are long-acting, reversible, more than 99% effective, fitted and removed by a clinician, and neither protects against STIs.

Sources

  1. NHSIUS (intrauterine system)
  2. NHSIUD (intrauterine device)
  3. ACOGLong-Acting Reversible Contraception (LARC): IUD and Implant

More comparisons

Last reviewed 10 October 2026. Spotted a mistake?