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Data updated: Mar 10, 2026

SYNAGIS

PALIVIZUMAB Fusion Protein Inhibitors
Cardiovascular Approved 1998-06-19

Synagis (palivizumab) is a monoclonal antibody indicated for the prevention of serious lower respiratory tract disease caused by respiratory syncytial virus (RSV) in high-risk pediatric patients. The therapy is specifically approved for infants with a history of premature birth, as well as children up to 24 months of age with bronchopulmonary dysplasia or hemodynamically significant congenital heart disease. It is used as a preventive measure during the RSV season and is not indicated for the treatment of active RSV disease.

Source: FDA Label • SWEDISH ORPHAN • Respiratory Syncytial Virus Anti-F Protein Monoclonal Antibody

How SYNAGIS Works

Palivizumab is a recombinant humanized monoclonal antibody that acts as a respiratory syncytial virus (RSV) F protein inhibitor. By targeting the F protein on the surface of the virus, the drug provides specific anti-RSV activity to protect the lower respiratory tract. This mechanism prevents the virus from causing serious infection in vulnerable pediatric populations.

Source: FDA Label
3
Indications
--
Phase 3 Trials
1
Priority Reviews
27
Years on Market

Details

Status
Prescription
First Approved
1998-06-19
Routes
N/A
Dosage Forms
VIAL

Companies

Active Ingredient: PALIVIZUMAB

SYNAGIS Approval History

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What SYNAGIS Treats

3 indications

SYNAGIS is approved for 3 conditions since its original approval in 1998. These indications span multiple therapeutic areas including oncology, immunology, and more.

  • Prevention of serious lower respiratory tract disease caused by respiratory syncytial virus (RSV) in pediatric patients with a history of premature birth (less than or equal to 35 weeks gestational age) who are 6 months of age or younger at the beginning of RSV season.
  • Prevention of serious lower respiratory tract disease caused by respiratory syncytial virus (RSV) in pediatric patients with bronchopulmonary dysplasia (BPD) that required medical treatment within the previous 6 months and who are 24 months of age or younger at the beginning of RSV season.
  • Prevention of serious lower respiratory tract disease caused by respiratory syncytial virus (RSV) in pediatric patients with hemodynamically significant congenital heart disease (CHD) and who are 24 months of age or younger at the beginning of RSV season.
Source: FDA Label
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Key Completed Trials

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Completed studies with published results, ranked by significance

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Trial Timeline

Full development history with FDA approval milestones

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Understanding FDA Approval Types
Count Type What it means
- ORIG Original approval - drug first enters market
- SUPPL - Efficacy New indication (new disease/condition approved)
- SUPPL - Labeling Label text changes (warnings, dosing updates)
- SUPPL - Manufacturing Production changes (new facility)
- SUPPL - Chemistry Formulation changes (new dosage strength)

Green lines in the timeline show ORIG and Efficacy approvals - the clinically meaningful milestones.

SYNAGIS FDA Label Details

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Indications & Usage

FDA Label (PDF)

Synagis is indicated for the prevention of serious lower respiratory tract disease caused by respiratory syncytial virus (RSV) in pediatric patients: with a history of premature birth (less than or equal to 35 weeks gestational age) and who are 6 months of age or younger at the beginning of RSV season, with bronchopulmonary dysplasia (BPD) that required medical treatment within the previous 6 months and who are 24 months of age or younger at the beginning of RSV season, with hemodynamically significant congenital heart disease (CHD) and who are 24 months of age or younger at the beginning of R...

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Data Sources

Data sourced from official FDA and NIH databases. Click links to verify on original sources.