Join more than 6 million moms who've had their babies BeyrifiedTM—verified they got Beyfortus—a layer of protection against serious RSV lung infection.
What is RSV?
RSV, or respiratory syncytial virus, is a common virus that spreads quickly and easily, especially during colder months. As a parent, it’s important to learn about RSV and how Beyfortus can help protect your baby from severe RSV lung infection.
RSV is a leading cause of hospitalization in babies under 1.
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2 out of 3 babies will get RSV by age 1.
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RSV is unpredictable—while most cases are mild, it’s hard to know which babies will get it or how severe it may become.
Get to know Beyfortus
Beyfortus is a preventive antibody designed to help protect babies from serious RSV lung infection. It's not a vaccine—it works by providing the antibodies that a baby's developing immune system lacks to help them fight RSV.
Beyfortus is the #1 prescribed RSV protection for babies* . It's for babies entering their first RSV season and may be given in the hospital at birth or during any visit with their pediatrician within their first year. Now's a good time to explore how Beyfortus can help protect your baby this RSV season.
*IQVIA data through March 2025
Is Beyfortus right for my baby?
Beyfortus is a prescription medicine used to help prevent a serious lung disease caused by Respiratory Syncytial Virus (RSV) in:
- Newborns and babies under 1 year of age born during or entering their first RSV season.
- Children up to 24 months of age who remain at risk of severe RSV disease through their second RSV season.
Support & resources
Ready to talk to your baby’s doctor? We can help.
Starting the conversation about RSV protection can feel overwhelming, but a little bit of prep can go a long way. Our doctor discussion guides include simple, helpful questions to bring along to your next visit so you don’t have to figure it out on the spot.
Parent-to-be guide PDF
New parent guide PDF
Help and guidance from day one
Whether you’re learning about RSV for the first time or getting ready for a pediatrician visit, we’re here to help. On our parent resources page, you can sign up for personalized updates and download helpful resources—all in one place.
Your child should not take Beyfortus if your child has a history of serious allergic reactions to nirsevimab-alip or any of the ingredients in Beyfortus.
Before your child receives Beyfortus, tell your healthcare provider about all of your child’s medical conditions, including if your child:
- has ever had a reaction to Beyfortus.
- has bleeding or bruising problems. If your child has a problem with bleeding or bruises easily, an injection could cause a problem.
Tell your healthcare provider about all the medicines your child takes, including prescription and over-the-counter medicines, vitamins, and herbal supplements. Your infant should not receive a medicine called palivizumab if they have already received Beyfortus in the same RSV season.
Serious allergic reactions have happened with Beyfortus. Get medical help right away if your child has any of the following signs or symptoms of a serious allergic reaction:
- swelling of the face, mouth, or tongue
- difficulty swallowing or breathing
- unresponsiveness
- bluish color of skin, lips, or under fingernails
- muscle weakness
- severe rash, hives, or itching
The most common side effects of Beyfortus include rash and pain, swelling, or hardness at the site of your child’s injection. These are not all the possible side effects of Beyfortus. Call your healthcare provider if you have questions about side effects.
Please see full Prescribing Information, including Patient Information, for more details.
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Beyfortus is a prescription medicine used to help prevent a serious lung disease caused by Respiratory Syncytial Virus (RSV) in:
- Newborns and babies under 1 year of age born during or entering their first RSV season.
- Children up to 24 months of age who remain at risk of severe RSV disease through their second RSV season.
