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Avonex and Breastfeeding
No clinical studies have been conducted on Avonex and breastfeeding, so it is not known whether the drug passes through breast milk. Since Avonex is a delicate molecule that can be destroyed by the digestive system if taken by mouth, however, it would probably be destroyed and inactivated by the digestive system of the infant (if it does pass through breast milk).
Avonex® (interferon beta-1a) is a prescription medication used to treat multiple sclerosis. It belongs to a group of medications known as interferons. The manufacturer of Avonex recommends that women avoid breastfeeding while taking Avonex. Therefore, be sure to talk with your healthcare provider if you take Avonex and are breastfeeding or thinking of starting.
No studies have been conducted on whether Avonex passes through breast milk. However, Avonex is a delicate molecule that cannot be taken by mouth (it must be injected), since the digestive system would destroy the molecule. Therefore, even if Avonex passes through breast milk, it would be destroyed and inactivated by the digestive system of the infant. However, since no studies have been performed, it is impossible to predict exactly what effects Avonex may cause in a breastfed infant.
You should talk with your healthcare provider about Avonex 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, you and your healthcare provider can make a shared decision about Avonex and breastfeeding in your particular situation.
Written by/reviewed by: Kristi Monson, PharmD; Arthur Schoenstadt, MD
Last reviewed by: Kristi Monson, PharmD