Important Safety Information | Full Prescribing Information

See for Yourself

Mirena is an IUD made of soft, flexible plastic that’s placed into your uterus by a healthcare provider.

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Kim’s StoryKim’s Story

Kim wanted birth control
with no daily routine.

Important Safety Information | Full Prescribing Information

Kim’s Story

Kim wanted birth control with no daily routine.

Other Videos

See for YourselfSee for Yourself

Effective birth control that lasts for as
long as Kim wants, for up to 5 years.

Important Safety Information | Full Prescribing Information

A Mother’s Thoughts

A mother considers her reasons
for choosing Mirena.

Other Videos

Kim’s StoryKim’s Story

Kim wanted birth control
with no daily routine.

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Reduces Heavy Periods

Mirena is the first and only birth control that's FDA-approved to treat heavy periods in women who choose intrauterine birth control.

How it helps
See Mirena for Yourself

See Mirena up close and compare its size to everyday items.

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How Does Mirena Work

Mirena is more than 99% effective at preventing pregnancy for as long as you want for up to 5 years.

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Mirena prevents pregnancy, most likely in several ways:

Thickens cervical mucus to prevent sperm from entering your uterus

Inhibits sperm from reaching or fertilizing your egg

Thins the lining of your uterus

Mirena may stop the release of your egg from your ovary, but this is not the way it works in most cases. While there’s no single explanation for how Mirena works, most likely, the above actions work together to prevent pregnancy for up to 5 years.

Mirena does not protect against HIV or STDs.

As soon as Mirena is placed in your uterus by your healthcare provider, it starts releasing small amounts of the hormone levonorgestrel into your uterus to provide continuous birth control for as long as you want, for up to 5 years.

Mirena and hormones

Mirena is estrogen-free. It releases small amounts of levonorgestrel, a progestin hormone found in many birth control pills, locally into your uterus at a slow and steady rate. Only small amounts of hormone enter your blood.

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Mirena may also help treat heavy periods in women who choose intrauterine contraception. The hormone in Mirena reduces the monthly thickening of the uterine lining.

Next: See Mirena Up Close