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Influenza virus vaccine, h1n1, live Side Effects

For the Consumer

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

In addition to its needed effects, some unwanted effects may be caused by influenza virus vaccine, h1n1, live. In the event that any of these side effects do occur, they may require medical attention.

Severity: Major

You should check with your doctor immediately if any of these side effects occur when taking influenza virus vaccine, h1n1, live:

More common:
  • Chills
  • cough
  • fever
  • runny nose
  • sore throat
  • stuffy nose
  • wheezing
Less common:
  • Headache
  • pain or tenderness around the eyes and cheekbones
  • shortness of breath or troubled breathing
  • tightness of the chest
Incidence not known:
  • Bloody nose
  • difficulty with swallowing
  • dizziness
  • fast heartbeat
  • hives
  • inability to move the arms and legs
  • itching
  • puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue
  • skin rash
  • sudden numbness and weakness in the arms and legs
  • unusual tiredness or weakness
  • weakness of the muscles in your face

Severity: Minor

Some of the side effects that can occur with influenza virus vaccine, h1n1, live may not need medical attention. As your body adjusts to the medicine during treatment these side effects may go away. Your health care professional may also be able to tell you about ways to reduce or prevent some of these side effects. If any of the following side effects continue, are bothersome or if you have any questions about them, check with your health care professional:

More common:
  • Abdominal or stomach pain
  • decreased appetite
  • irritability
  • muscle aches
  • tiredness or weakness
  • unusual drowsiness, dullness, tiredness, weakness, or feeling of sluggishness
Less common:
  • Earache
  • redness or swelling in the ear
Incidence not known:
  • Diarrhea
  • nausea
  • vomiting

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.

Disclaimer: Every effort has been made to ensure that the information provided is accurate, up-to-date and complete, but no guarantee is made to that effect. In addition, the drug information contained herein may be time sensitive and should not be utilized as a reference resource beyond the date hereof. This material does not endorse drugs, diagnose patients, or recommend therapy. This information is a reference resource designed as supplement to, and not a substitute for, the expertise, skill , knowledge, and judgement of healthcare practitioners in patient care. The absence of a warning for a given drug or combination thereof in no way should be construed to indicate safety, effectiveness, or appropriateness for any given patient. does not assume any responsibility for any aspect of healthcare administered with the aid of materials provided. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the substances you are taking, check with your doctor, nurse, or pharmacist.