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Signs and Symptoms

The symptoms of severe RSV disease

It's important to ask your baby's healthcare provider about symptoms to look out for, especially during your baby's first months at home.

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If your baby has RSV disease

  • He or she will start to get sick about 4 to 6 days after being infected
  • You might start noticing some symptoms of the infection like coughing, sneezing, and fever

Severe RSV disease signs and symptoms

If you see any of these RSV disease warning signs, call your baby's healthcare provider right away:

  • Coughing or wheezing that does not stop
  • Fast or troubled breathing
  • A fever (especially if it is greater than 100.4°F [rectal] in infants under 3 months of age)
  • A bluish color around the mouth or fingernails
  • Spread-out nostrils and/or a caved-in chest when trying to breathe

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Important Safety Information

What is Synagis ® (palivizumab)?

Synagis is a prescription medication that is used to help prevent a serious lung disease caused by respiratory syncytial virus (RSV) in children at high risk for severe lung disease from RSV.

Who should not receive Synagis?

Children should not receive Synagis if they have ever had a severe allergic reaction to it. Signs and symptoms of a severe allergic reaction could include itchy rash; swelling of the face; difficulty swallowing; difficulty breathing; bluish color of the skin; muscle weakness or floppiness; a drop in blood pressure; and/or unresponsiveness. If your child has any of these signs or symptoms of a severe allergic reaction after getting Synagis, be sure to tell your child’s healthcare provider or get medical help right away.

How is Synagis given?

Synagis is given as a shot, usually in the thigh muscle, each month during the RSV season. Your child should receive their first Synagis shot before the RSV season starts, to help protect them before RSV becomes active. When RSV is most active, your child will need to receive Synagis shots every 28-30 days to help protect them from severe RSV disease for about a month. Your child should continue to receive monthly shots of Synagis until the end of RSV season. Your child may still get severe RSV disease after receiving Synagis. If your child has an RSV infection, they should continue to get their monthly shots throughout the RSV season to help prevent severe disease from new RSV infections.

The effectiveness of Synagis shots given less than monthly throughout the RSV season has not been established.

What are the side effects of Synagis?

Possible, serious side effects include severe allergic reaction, which may occur after any dose of Synagis. Such reactions may be life-threatening or cause death. Unusual bruising and/or groups of tiny red spots on the skin have also been reported.

Common side effects of Synagis include fever and rash. Other possible side effects include skin reactions around the area where the shot was given (like redness, swelling, warmth, or discomfort).

Please see full Prescribing Information for Synagis, including Patient Information.