Prostate Cancer Home > Emcyt and Breastfeeding

It is not clear whether Emcyt (estramustine) would pass through breast milk in women or if it would harm a nursing infant. However, this drug is not approved for use in women and would not likely be prescribed for women who are breastfeeding. Emcyt is only approved to treat prostate cancer in men.

Can Breastfeeding Women Take Emcyt?

At this time, it is unknown if Emcyt® (estramustine phosphate) passes through human breast milk. However, this drug is only approved to treat prostate cancer, and therefore is only used in men. If you are nursing a child, talk with your healthcare provider before taking Emcyt.

More Information on Breastfeeding and Emcyt

There is very little information available about using Emcyt while breastfeeding. The drug has not been studied in women who were nursing or in breastfeeding animals. Therefore, it is unknown if the medication passes through breast milk or if it would harm a nursing child.
Emcyt is a medicine that combines estradiol, a female hormone, with a chemotherapy medicine known as nornitrogen mustard. Estradiol passes through breast milk in small amounts. Although the amounts of estradiol found in breast milk are generally too low to cause any significant problems in a nursing infant, the medication may decrease the production and quality of breast milk.
There is even less information available on the chemotherapy drug portion of Emcyt. However, in general, nitrogen mustards are considered toxic, and should usually be avoided while breastfeeding.
Perhaps more importantly, Emcyt is not approved for use in women. At this time, there is no well-accepted medical reason for a woman to take this drug.

Talking With Your Healthcare Provider

You should discuss breastfeeding and Emcyt use with your healthcare provider. 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, the two of you can make a shared decision that is right for you.
Written by/reviewed by:
Last reviewed by: Kristi Monson, PharmD;
Last updated/reviewed:
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