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Influenza virus vaccine, h1n1, live Side Effects

For the Consumer

Applies to influenza virus vaccine, h1n1, live: intranasal spray suspension

Side effects include:

Only limited data available to date regarding adverse effects of intranasal live influenza A (H1N1) 2009 vaccine. (See Ongoing Safety Review under Cautions.) Adverse effects expected to be similar to those reported with seasonal intranasal live influenza vaccine.

Most common adverse effects reported with seasonal intranasal live influenza vaccine are runny nose/nasal congestion, decreased appetite, irritability, lethargy, abdominal pain, sore throat, fever, headache, muscle aches, decreased activity, and chills in children 2–17 years of age and runny nose, headache, sore throat, tiredness/weakness, muscle aches, cough, chills, nasal congestion, and sinusitis in adults 18–49 years of age.

For Healthcare Professionals

Applies to influenza virus vaccine, h1n1, live: nasal spray


Respiratory side effects have included nasal congestion, runny nose, sore throat, and cough.[Ref]


Gastrointestinal side effects have included nausea, vomiting, and diarrhea.[Ref]


Dermatologic side effects have included rash.[Ref]


General side effects have included tiredness/weakness and chills.[Ref]


Hypersensitivity side effects have included anaphylactic reactions, facial edema and urticaria.[Ref]


Musculoskeletal side effects have included muscle aches.[Ref]

Nervous system

Nervous system side effects have included headache, Guillain-Barre syndrome and Bell's Palsy.[Ref]


1. "Product Information. Influenza Virus Vaccine, H1N1, Live (influenza virus vaccine, H1N1, live)." Medimmune Inc, Gaithersburg, MD.

Not all side effects for influenza virus vaccine, h1n1, live may be reported. You should always consult a doctor or healthcare professional for medical advice. Side effects can be reported to the FDA here.

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