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Animal studies have shown that Samsca (tolvaptan) does pass through breast milk in rats. However, studies have not been done on whether the drug would pass through human breast milk. Due to the potentially serious risks, the manufacturer of the drug recommends that breastfeeding women avoid Samsca.

Can Breastfeeding Women Take Samsca?

At this time, it is not known if Samsca® (tolvaptan) passes through breast milk in humans. The manufacturer of the medication recommends that it not be given to women who are nursing. Therefore, if you are breastfeeding or plan to start, talk with your healthcare provider before taking Samsca.

More Information on Samsca and Breastfeeding

In animal studies, Samsca was shown to pass through the breast milk of rats. However, no studies have been done to see if the drug passes through breast milk in humans. Therefore, it is not known whether the medicine would be found in breast milk, or if it would harm a nursing child.
Many medicines pass through breast milk. Because there is the potential for serious side effects to occur in a nursing infant exposed to Samsca through breast milk, the manufacturer recommends that women either take Samsca or breastfeed, but not do both.

Talking With Your Healthcare Provider

You should discuss breastfeeding and Samsca 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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