• Text Resize A A A
  • Print Print
  • Share Share Share Share

Intrauterine Device (IUD)

How effective is it?

Of 100 women who use an IUD each year, less than one may become pregnant. IUDs are better at preventing pregnancy than condoms, the pill, the patch, the ring, and the shot.

Advantages of an IUD

  • Safe and effective in preventing pregnancy—even more effective than other methods of reversible birth control
  • Along with implants, IUDs are the most cost-effective reversible method of birth control
  • IUDs work for many years.
  • IUDs can be taken out at any time if you want to get pregnant or are unhappy with it
  • The Copper T IUD can also be used as emergency contraception to prevent pregnancy if inserted within five days after unprotected sex
  • There is nothing you have to remember, which can be great for people who have a hard time remembering or don't want to remember to use other methods like the pill, patch, or ring.
  • Your male partner doesn't have to know about it or do anything different.

How do I get it?

An IUD can only be inserted by a health care professional. Most family planning clinics offer IUDs. To search for a clinic near you use our Clinic Locator.

Download IUD Fact Sheet

Quick Facts


Effectiveness in Preventing Pregnancy

  • Of 100 women using IUDs for a year, about one may become pregnant. IUDs are better at preventing pregnancy than condoms, the pill, the patch, the ring, and the shot.


  • You must have a health care provider insert an IUD in to the uterus. An IUD is effective for 3-10+ years, depending on the type that is used.

STI Protection

  • No

Office Visit Required

  • Yes, only available through a health care provider.

What is an Intrauterine Device (IUD)?

An IUD is a small T-shaped device that is put in the uterus by a healthcare provider. It sits in your uterus and your cervix keeps it in place. Once it's in, you can't feel it. Two types are available in the U.S.:

  • The Copper T IUD is made with copper and plastic. It prevents pregnancy by blocking sperm from reaching or fertilizing the egg, and may prevent implantation.
  • Hormonal IUDs contain the hormone progestin. Hormones are chemicals that control how different parts of your body work. The progestin causes cervical mucus to thicken and the lining of the uterus to thin. This keeps the sperm from reaching the egg.

How do I use it?

An IUD is placed through your vagina and cervix and into your uterus by a health care provider. The Copper T IUD will prevent pregnancy right away. It may take a week for a hormonal IUD to begin working, so ask if you need to use a back-up birth control method (like a condom) in the meantime.

Once in place, Copper T IUDs are effective for 10 years or more. The hormonal-type IUD will last for three to five years. But any IUD can be taken out at any time. Just ask your healthcare provider.

It is common for women to have some mild discomfort, cramping, and spotting after the IUD is first inserted. In most cases, this will become milder or go away in a few weeks or months. Ask your health care provider about what types of symptoms you should expect.

Your health care provider may also ask you to check your IUD strings on your own between visits to make sure they can be felt in your vagina. They will tell you more about how to do this.

Very rarely, an IUD may come out of your uterus on its own. This is more common in women who have never had a baby. If the IUD comes out, do not try to put it back yourself. Call your healthcare provider and they will insert another one for you.


  • Requires a clinic visit for insertion
  • Provides no protection against sexually transmitted infections (STIs), including HIV
  • May cause side effects like cramping and irregular bleeding
  • While not common, a few women may develop pelvic infections with an IUD, most often within three weeks after insertion.
  • Rarely, IUDs will come out of the uterus.


Centers for Disease Control and Prevention

Food and Drug Administration

Office on Women's Health

Content created by Office of Population Affairs
Content last reviewed on August 16, 2016