Mirena and Breastfeeding

Although the hormone in Mirena does pass through breast milk, it is not likely to affect the quantity and quality of the milk. However, Mirena may increase the risk for uterine perforation in women who are breastfeeding. If you are thinking about using Mirena and breastfeeding at the same time, make sure your healthcare provider explains the risks and benefits.

Is Mirena Safe During Breastfeeding?

Mirena® is an intrauterine contraceptive (IUC) that is used to prevent pregnancy. It is a device that is inserted into the uterus and left in place for up to five years. It works by slowly releasing levonorgestrel (a progestin hormone) into the body.

Mirena and Breastfeeding Research

It is a widespread misconception that Mirena is just an intrauterine device (IUD) that cannot expose a breastfed infant to any hormones. However, this is simply not true. The hormones in Mirena reach the bloodstream in the mother and do pass through the breast milk to the infant.
It's important to note that Mirena is a progestin-only contraceptive (which contains no estrogen). These contraceptives are not likely to affect the quantity and quality of breast milk.
Women who are breastfeeding may have a higher risk for uterine perforation due to Mirena. Your healthcare provider may not be comfortable inserting Mirena while you are breastfeeding, especially if he or she has not had much experience using Mirena.

Talking With Your Healthcare Provider About Mirena and Breastfeeding

You should talk with your healthcare provider about Mirena and breastfeeding. Each woman's situation is different, and you and your healthcare provider understand your situation best. After considering what you want and expect, as well as your current health situation, you and your healthcare provider can make a shared decision about Mirena and breastfeeding that is right for you.
Last reviewed by: Kristi Monson, PharmD
Pregnancy and Pain