Fareston and Breastfeeding

It is unknown if Fareston (toremifene) passes through breast milk in women or if it would harm a nursing infant. However, because this drug is associated with potentially serious complications, the manufacturer recommends that women not breastfeed during treatment. Also, Fareston is specifically approved for use in postmenopausal women, who would not be nursing.

Can Breastfeeding Women Take Fareston?

Fareston® (toremifene citrate) is a prescription drug that belongs to a group of medicines known as selective estrogen receptor modulators, or SERMs for short. It is approved to treat certain types of metastatic (spreading) breast cancer in women who have gone through menopause.
At this time, it is not known if Fareston passes through breast milk in women. Therefore, if you are breastfeeding or plan to start, talk with your healthcare provider before taking this drug.

More Information on Fareston and Breastfeeding

No research has been done on Fareston in breastfeeding women. Therefore, researchers do not know for certain whether the drug would be found in breast milk or whether it would harm a nursing child.
In animal studies, Fareston was shown to pass through the breast milk of rats. Thus, it is not unreasonable to assume that the drug could also pass through human breast milk.
Because many drugs are passed through breast milk, and because Fareston has the potential to cause serious side effects, the manufacturer recommends it not be used in breastfeeding women. In addition, Fareston is only approved for use in postmenopausal women. It is not approved for use in premenopausal women, including those who are breastfeeding.
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