Influenza virus vaccine, live (Into the nose)

Influenza Virus Vaccine, Live (in-floo-EN-za VYE-rus VAX-een, lyve)

Helps prevent infection with influenza (flu) virus.

Brand Name(s):

FluMist Trivalent 2024-2025 Formula, FluMist Trivalent 2025-2026 Formula, FluMist Trivalent 2025-2026 Formula Self-Admin

When This Medicine Should Not Be Used:

How to Use This Medicine:

Spray

• A nurse or other trained health professional will give you this medicine. This vaccine is given as a nasal spray.
• Children 2 to 8 years old who have not previously received influenza vaccine will need 2 doses of the vaccine given at least 1 month apart. If your child needs a second dose, make sure he or she receives it on schedule.
• Read and follow the patient instructions that come with this medicine. Talk to your doctor or pharmacist if you have any questions.
• Missed dose: Call your doctor or pharmacist for instructions.
• If you store this medicine at home, keep it in the refrigerator. Do not freeze.

Drugs and Foods to Avoid:

Ask your doctor or pharmacist before using any other medicine, including over-the-counter medicines, vitamins, and herbal products.

• This vaccine should not be given to children and teenagers 2 to 17 years old who are also taking aspirin. Children and teenagers 2 to 17 years old should not take aspirin for 4 weeks after receiving the vaccine.
• Medicine to treat influenza virus infection (including amantadine, oseltamivir, rimantadine, zanamivir) used within 2 days before or 2 weeks after administration of the influenza virus vaccine may make the vaccine less effective.

Warnings While Using This Medicine:

• Tell your doctor if you are pregnant or breastfeeding, or if you have kidney disease, heart disease, diabetes, breathing problems (including asthma or wheezing), immune system problems (including cancer or HIV), or a history of Guillain-Barré syndrome. Tell your doctor if you live with someone who has a weakened immune system.
• The influenza virus vaccine may not protect everyone who receives it. The vaccine will not treat flu symptoms if you have already been infected with the virus.

Possible Side Effects While Using This Medicine:

Call your doctor right away if you notice any of these side effects:

• Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing
• Fever, chills, cough, runny or stuffy nose, sore throat, and body aches
• Headache
• Severe muscle weakness
• Trouble breathing

If you notice these less serious side effects, talk with your doctor:

• Decreased appetite
• Tiredness

If you notice other side effects that you think are caused by this medicine, tell your doctor

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088

Last Updated: 1/4/2026