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Is it safe to take Keytruda if I am pregnant or breastfeeding?

No. Keytruda (pembrolizumab) fights melanoma cancer cells by making it easier for the immune system to attack them. Animal studies suggest that the chemicals blocked by Keytruda are needed to protect the fetus during pregnancy. In theory, receiving Keytruda during pregnancy could cause serious harm to the baby or loss of the pregnancy. 

Doctors don't know if Keytruda is released in breast milk. Because of the possible risks to the baby, though, doctors recommend that women stop nursing while being treated with Keytruda. 

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.