Synagis Side Effects

Generic name: palivizumab

Medically reviewed by Drugs.com. Last updated on May 19, 2024.

Note: This document provides detailed information about Synagis Side Effects associated with palivizumab. Some dosage forms listed on this page may not apply specifically to the brand name Synagis.

Applies to palivizumab: intramuscular solution.

Serious side effects of Synagis

Along with its needed effects, palivizumab (the active ingredient contained in Synagis) may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor or nurse immediately if any of the following side effects occur while taking palivizumab:

More common side effects

• bluish color of the fingernails, lips, skin, palms, or nail beds
• blurred vision
• confusion
• cough
• difficulty with breathing
• difficulty with swallowing
• dizziness
• dizziness, faintness, or lightheadedness when getting up suddenly from a lying or sitting position
• fast heartbeat
• fever
• hives or welts
• irregular, fast or slow, or shallow breathing
• itching
• large, hive-like swelling on the face, eyelids, lips, tongue, throat, hands, legs, feet, or sex organs
• loss of strength or energy
• muscle pain or weakness
• redness of the skin
• shortness of breath
• skin rash
• sweating
• tightness in the chest
• unresponsiveness
• unusual tiredness or weakness
• wheezing

Incidence not known

• black, tarry stools
• bleeding gums
• blood in the urine or stools
• pinpoint red spots on the skin
• unusual bleeding or bruising

Other side effects of Synagis

Some side effects of palivizumab may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects.

Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

Incidence not known

• bleeding, blistering, burning, coldness, discoloration of the skin, feeling of pressure, hives, infection, inflammation, itching, lumps, numbness, pain, rash, redness, scarring, soreness, stinging, swelling, tenderness, tingling, ulceration, or warmth at the injection site

For healthcare professionals

Applies to palivizumab: intramuscular powder for injection, intramuscular solution.

General adverse events

The most serious adverse reactions are anaphylaxis and other acute hypersensitivity reactions.^[Ref]

Gastrointestinal

• Common (1% to 10%): Nausea, vomiting, diarrhea^[Ref]

Hypersensitivity

• Frequency not reported: Anaphylaxis, anaphylactic shock (sometimes fatal)
• Postmarketing reports: Angioedema^[Ref]

Local

• Common (1% to 10%): Injection site reactions^[Ref]

Other

• Very common (10% or more): Pyrexia^[Ref]

Dermatologic

• Very common (10% or more): Rash
• Uncommon (0.1% to 1%): Urticaria
• Frequency not reported: Pruritus^[Ref]

Cardiovascular

• Frequency not reported: Arrhythmia (during studies of congenital heart disease patients)^[Ref]

Hematologic

• Uncommon (0.1% to 1%): Thrombocytopenia (mild), eosinophilia (mild)
• Postmarketing reports: Severe thrombocytopenia (platelet count less than 50,000/microliter)^[Ref]

Nervous system

• Uncommon (0.1% to 1%): Convulsions^[Ref]

Respiratory

• Frequency not reported: Cyanosis during studies of congenital heart disease patients
• Postmarketing reports: Dyspnea, asthma, bronchospasm^[Ref]

Frequently asked questions

• What are the symptoms of RSV (respiratory syncytial virus)?

Further information

Synagis side effects can vary depending on the individual. Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Note: Medication side effects may be underreported. If you are experiencing side effects that are not listed, submit a report to the FDA by following this guide.

Medical Disclaimer