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All About the IUD


Updated September 26, 2013

All About the IUD


Photo © Dawn Stacey

IUD Definition:

An IUD is a small, flexible contraceptive device that is inserted into the uterus. The letters IUD stand for intrauterine device. An IUD is usually made of plastic and is shaped like the letter T. This contraceptive method is long lasting, safe and extremely effective.

Two IUD brands are available in the United States: Mirena and ParaGard. According to Planned Parenthood, the IUD is the most popular form of reversible birth control in the world. In fact, most women who get an IUD are satisfied with their choice -- 99% of IUD users are pleased with them.

Mirena IUD:

The Mirena intrauterine device (IUD) is made of flexible plastic. It releases a low amount of progestin levonorgestrel continuously over a 5-year period as a way to prevent pregnancy.

According to the manufacturer of Mirena, Bayer HealthCare Pharmaceuticals, this IUD is for women who have had at least 1 child, are in a mutually monogamous relationship, and have no risk or history of ectopic pregnancy or pelvic inflammatory disease. BUT, the American College of Obstetricians and Gynecologists advocates that both women who have never given birth and teens could benefit from using IUDs... this includes using Mirena or the ParaGard IUD.

The Mirena IUD can reduce menstrual cramps, the amount of period bleeding and had been FDA-approved to treat heavy menstrual bleeding. After removing the IUD, your ability to get pregnant quickly returns.

ParaGard IUD:

The ParaGard intrauterine device (also called the Copper T 380A) is about 1-1/4 inches wide by 1-3/8 inches long, made of flexible plastic and wrapped in copper. It is hormone free. Note that with ParaGard, your periods won't get shorter or lighter; rather, they may get heavier and longer. The ParaGard IUD releases a tiny amount of copper over a 10-year period as a way to prevent pregnancy.

An Extra Advantage: The ParaGard IUD can be used as a form of emergency contraception. In fact, if inserted within 5 days after unprotected intercourse, ParaGard can lower the risk of pregnancy by 99.9%.

How the IUD Works:

Both the Mirena IUD and the ParaGard IUD prevent sperm from joining with an egg by interfering with the movement of the sperm toward the egg. Both IUDs also change the lining of the uterus. In theory, this change to the uterine wall may keep a fertilized egg from attaching to the lining of the uterus, but there is no proof that this actually happens.

For some women, the progestin in the Mirena IUD may also prevent ovulation from occurring. The progestin also thickens a woman's cervical mucus, so the thicker mucus can further block sperm from joining with an egg.

IUD Insertion:

Most women can use either IUD safely. But, some increased risk factors may not make the IUD the ideal birth control method for some women:The IUD must be inserted by a qualified healthcare professional. The IUD insertion usually includes a bimanual examination. The doctor will remove the IUD from its sterile packaging. Then, the arms of the IUD are bent back, and a tube containing the IUD is inserted. The IUD is pushed into place by a plunger in the tube. Once out of the tube and in the proper position, the IUD arms open into the "T” shape.

Many women report experiencing cramping and pinching sensations during the IUD insertion. Some women may feel a bit dizzy. Although there may be some discomfort, the whole procedure only takes a few minutes. It may also be helpful to know that despite what many people believe, IUDs do NOT cause pelvic inflammatory disease and infertility.

After the IUD Insertion:

Some women may still feel some cramping as the uterus adjusts to the placement of the IUD. If this is the case, the cramps should lessen with some time and, perhaps, some rest or pain medication. You may also have some bleeding and spotting during the first few days after insertion.

IUD Pregnancy Protection:

You can have sex as soon as you feel comfortable after the IUD insertion.
  • ParaGard IUD is effective immediately.

  • Mirena IUD is effective immediately ONLY if inserted within 7 days after the start of your period. If inserted at any other time during your menstrual cycle, use another contraceptive like a condom, female condom, Today Sponge or spermicide during the first week after the IUD insertion. Protection will begin after seven days.

STD Protection:

An IUD won’t protect you against sexually transmitted diseases.

IUD Maintenance:

If an IUD is going to slip out of place, it will most likely happen in the first few months of use or during your period. Check your pads or tampons to see if your IUD has fallen out. If it has, call your doctor and use another birth control method. It is especially important to check the IUD strings every few days for the first few weeks and to feel for the string ends between periods to make sure that the IUD is still properly in place.

IUD Costs:

The cost of an IUD -- a one-time, lump fee of $175 to $650 -- may sound high. But it is the most inexpensive long-term and reversible form of birth control available. Since an IUD's protection can last 5 to 10 years, the expense ends up being less per month than the monthly filling of Pill prescriptions.

The costs of an IUD may include:

  • A medical exam
  • The Mirena IUD or ParaGard IUD
  • Follow-up visits to your doctor
IUD costs vary amongst health insurance plans so call your insurance provider to find out about coverage.

IUD Removal:

You must eventually have an IUD removed since an IUD doesn’t disintegrate and, for the most part, will not come out on its own. The IUD removal procedure is often easier, less painful, and quicker than the insertion. You must have your IUD removed by a doctor -- never try to remove your IUD by yourself or ask an unqualified person to do so as this could cause serious damage. You can have your IUD removed at anytime and can have a new IUD replaced during the same visit.

IUD Effectiveness:

An IUD is one of the most effective birth control types available. Less than 1 out of 100 women will get pregnant each year if they use the ParaGard or the Mirena IUD.

Of special caution: Most pregnancies happen when an IUD slips out, and you don't realize this has happened. Even though the chance of pregnancy during IUD use is very low, if it does occur, you should contact your doctor as soon as you find out that you are pregnant.

More IUD Resources:


Nelson AL. "The intrauterine contraceptive device" Obstetrics and Gynecology Clinics of North America, 2000 27:723-740.

Planned Parenthood. IUD. Accessed 7/3/09.

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