Influenza a (H1N1) virus vaccine

Generic Name: influenza a (h1n1) virus vaccine (IN-floo-EN-za)
Brand Name: Generic only. No brands available.

Influenza a (H1N1) virus vaccine is used for:

Protecting against influenza (flu) disease caused by the H1N1 virus.

Influenza a (H1N1) virus vaccine is a vaccine. It works by stimulating the body to produce antibodies against the influenza A (H1N1) flu virus, which helps your body to fight the infection.

Do NOT use influenza a (H1N1) virus vaccine if:

  • you are allergic to any ingredient in influenza a (H1N1) virus vaccine, including neomycin, polymyxin, eggs, egg products, or chicken
  • you have had a severe allergic reaction (eg, rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue) to a prior flu vaccination

Contact your doctor or health care provider right away if any of these apply to you.

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Before using influenza a (H1N1) virus vaccine:

Some medical conditions may interact with influenza a (H1N1) virus vaccine. Tell your doctor or pharmacist if you have any medical conditions, especially if any of the following apply to you:

  • if you are pregnant, planning to become pregnant, or are breast-feeding
  • if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement
  • if you have allergies to medicines, foods, or other substances
  • if you are allergic to thimerosal (a preservative)
  • if you have a fever, cold, respiratory tract infection, or other infection or recent illness
  • if you have asthma or other breathing problems, a nervous system disorder, or blood or bleeding problems (eg, hemophilia, low blood platelet levels)
  • if you have cancer or immune system problems (eg, HIV, weakened immune system)
  • if you are receiving radiation treatment or chemotherapy
  • if you have a history of Guillain-Barré syndrome

Some MEDICINES MAY INTERACT with influenza a (H1N1) virus vaccine. Tell your health care provider if you are taking any other medicines, especially any of the following:

  • Corticosteroids (eg, prednisone) or other medicines that may weaken the immune system because they may decrease influenza a (H1N1) virus vaccine's effectiveness. Ask your doctor if you are unsure if any of your medicines may weaken the immune system

This may not be a complete list of all interactions that may occur. Ask your health care provider if influenza a (H1N1) virus vaccine may interact with other medicines that you take. Check with your health care provider before you start, stop, or change the dose of any medicine

How to use influenza a (H1N1) virus vaccine:

Use influenza a (H1N1) virus vaccine as directed by your doctor. Check the label on the medicine for exact dosing instructions.

  • Influenza a (H1N1) virus vaccine is given as an injection at your doctor's office, hospital, or clinic. Contact your health care provider if you have any questions.
  • Do not use influenza a (H1N1) virus vaccine if it contains particles, is cloudy or discolored, or if the vial is cracked or damaged.
  • If you miss a dose of influenza a (H1N1) virus vaccine, contact your doctor right away.

Ask your health care provider any questions you may have about how to use influenza a (H1N1) virus vaccine.

Important safety information:

  • If you have a fever, cold, respiratory tract infection, or other illness, contact your doctor before you receive influenza a (H1N1) virus vaccine. You may need to receive your injection at a later time.
  • Influenza a (H1N1) virus vaccine is not a cure for the flu. It must be given before you are exposed to the flu in order to be effective. It usually takes about 3 weeks before you will receive the full effect of the vaccine.
  • Influenza a (H1N1) virus vaccine contains inactivated viruses. It cannot cause you to develop the flu.
  • Influenza a (H1N1) virus vaccine may not protect everyone who receives it. It does not protect against other respiratory viruses.
  • Tell your doctor if you will be receiving any other vaccines.
  • Some of these products contain thimerosal (a preservative). If you have ever had an allergic reaction to thimerosal, ask your pharmacist if your product has thimerosal in it.
  • Use influenza a (H1N1) virus vaccine with caution in the ELDERLY; its effectiveness may be decreased in elderly patients. They may also be more sensitive to its effects, especially chills or shivering.
  • Caution is advised with using influenza a (H1N1) virus vaccine in CHILDREN; they may be more sensitive to its effects, especially fever, muscle pain, and general body discomfort.
  • Influenza a (H1N1) virus vaccine should be used with extreme caution in CHILDREN younger than 6 months old; safety and effectiveness in these children have not been confirmed.
  • PREGNANCY and BREAST-FEEDING: If you become pregnant, contact your doctor. You will need to discuss the benefits and risks of using influenza a (H1N1) virus vaccine while you are pregnant. It is not known if influenza a (H1N1) virus vaccine is found in breast milk. If you are or will be breast-feeding while you use influenza a (H1N1) virus vaccine, check with your doctor. Discuss any possible risks to your baby.

Possible side effects of influenza a (H1N1) virus vaccine:

All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome:

Chills or shivering (in elderly patients); general body discomfort; headache; mild bruising, pain, redness, swelling, or tenderness at the injection site; mild tiredness or weakness; muscle aches.

Seek medical attention right away if any of these SEVERE side effects occur:

Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue; unusual hoarseness); decreased movement of the face muscles; decreased movement or sensation in the arm or shoulder; muscle weakness; numbness or tingling of the hands or feet; seizures; severe or persistent headache or fever; shortness of breath or wheezing; vision changes.

This is not a complete list of all side effects that may occur. If you have questions about side effects, contact your health care provider. Call your doctor for medical advice about side effects. To report side effects to the appropriate agency, please read the Guide to Reporting Problems to FDA.

If OVERDOSE is suspected:

Contact 1-800-222-1222 (the American Association of Poison Control Centers), your local poison control center, or emergency room immediately.

Proper storage of influenza a (H1N1) virus vaccine:

Influenza a (H1N1) virus vaccine is usually handled and stored by a health care provider. If you are using influenza a (H1N1) virus vaccine at home, store influenza a (H1N1) virus vaccine as directed by your pharmacist or health care provider. Keep this product, as well as syringes and needles, out of the reach of children and away from pets.

General information:

  • If you have any questions about influenza a (H1N1) virus vaccine, please talk with your doctor, pharmacist, or other health care provider.
  • Influenza a (H1N1) virus vaccine is to be used only by the patient for whom it is prescribed. Do not share it with other people.
  • If your symptoms do not improve or if they become worse, check with your doctor.
  • Check with your pharmacist about how to dispose of unused medicine.

This information should not be used to decide whether or not to take influenza a (H1N1) virus vaccine or any other medicine. Only your health care provider has the knowledge and training to decide which medicines are right for you. This information does not endorse any medicine as safe, effective, or approved for treating any patient or health condition. This is only a brief summary of general information about influenza a (H1N1) virus vaccine. It does NOT include all information about the possible uses, directions, warnings, precautions, interactions, adverse effects, or risks that may apply to influenza a (H1N1) virus vaccine. This information is not specific medical advice and does not replace information you receive from your health care provider. You must talk with your healthcare provider for complete information about the risks and benefits of using influenza a (H1N1) virus vaccine.

Issue Date: April 2, 2014
Database Edition 14.2.1.001
Copyright © 2014 Wolters Kluwer Health, Inc.

Disclaimer: This information should not be used to decide whether or not to take this medicine or any other medicine. Only your health care provider has the knowledge and training to decide which medicines are right for you. This information does not endorse any medicine as safe, effective, or approved for treating any patient or health condition. This is only a brief summary of general information about this medicine. It does NOT include all information about the possible uses, directions, warnings, precautions, interactions, adverse effects, or risks that may apply to this medicine. This information is not specific medical advice and does not replace information you receive from your health care provider. You must talk with your healthcare provider for complete information about the risks and benefits of using this medicine.

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