Influenza Vaccine (Surface Antigen)

Influenza vaccine is a prescription medication used to protect people from the influenza virus, also known as "the flu."

Influenza vaccine belongs to a group of drugs called vaccines, that work by strengthening the immune system to better protect itself.

This medication comes in an injectable form, that is administered by a doctor, nurse or pharmacist. 

Common side effects include fatigue, muscle ache, and pain at the injection site.

Influenza vaccine is a prescription medication used to protect people from the influenza virus, also known as "the flu."

This medication may be prescribed for other uses. Ask your doctor or pharmacist for more information.

Influenza vaccine is given as a single dose (0.5 ml) by intramuscular (IM) injection into the upper arm.

Do not receive influenza vaccine if you have ever had a severe allergic reaction to a flu shot without talking to your doctor.

The most common side effect is pain at the site of the injection.

Other influenza vaccine side effects include:

• fatigue (tiredness)
• headache
• muscle ache

This is not a complete list of side effects. Ask your healthcare provider for more information.

Tell your healthcare provider if you are pregnant or plan to become pregnant. Influenza vaccine has been studied in animals and showed no evidence of harm to the fetus, however, no studies have been performed in pregnant women. Because the safety and effectiveness of influenza vaccine have not been established in pregnant women, you will need to discuss the risks of this vaccine with your healthcare provider.

The CDC warns that pregnant women are more likely to suffer severe complications related to influenza infection than women who are not pregnant. Additionally, there is a greater risk of premature labor and delivery in pregnant women with influenza.

Women who receive influenza vaccine while pregnant should be registered in the pregnancy registry by calling 1-888-855-7871. Flu shots have not been shown to cause harm to pregnant women or their babies.

Tell your healthcare provider if you are breastfeeding. Influenza vaccine has not been studied in breastfeeding mothers. It is not known if influenza vaccine is excreted in human milk or if it will harm your nursing baby.