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No studies have been done on Relenza (zanamivir) and breastfeeding, so it is not known if it is safe for women to use the drug while nursing a child. However, due to the unknown effects that could occur in the nursing infant, the manufacturer of the drug recommends that women use Relenza with caution while breastfeeding.

Is Relenza Safe During Breastfeeding?

At this time, it is not known if Relenza® (zanamivir) passes through breast milk in women. However, because of the unknown effects that could occur in the nursing infant, the manufacturer recommends that women use the medication with caution while breastfeeding. If you are breastfeeding, make sure to check with your healthcare provider before taking Relenza.
 

Relenza and Breastfeeding: What Does the Research Say?

No studies have been done to see if Relenza passes through breast milk in humans. However, it is known that the drug passes through breast milk in rats. If your healthcare provider decides that it is okay for you to take Relenza while breastfeeding, watch for any side effects or changes in your infant.
 
In general, very little information is known about using most drugs while breastfeeding, as it is usually considered unethical to study medications in women who are nursing. Although this lack of information can be frustrating, it is important to understand that this is done to protect babies, who cannot protect themselves.
 

Talking With Your Healthcare Provider About Relenza and Breastfeeding

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