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Overview: mFlusiva is a vaccine to help prevent the flu. A health care professional will give you this vaccine as an injection into a muscle. The most common side effect is pain at the injection site. This vaccine will not give you the flu, but you may have a headache, tiredness, and muscle pain after getting it. Getting vaccinated each year is one way to keep yourself from getting sick with the flu.

Uses

What is mFlusiva used for?

mFlusiva (influenza vaccine) is commonly given to certain people to help prevent the flu, a very contagious infection caused by influenza A and B viruses.

How does mFlusiva work (mechanism of action)?

mFlusiva is an mRNA vaccine. It triggers your immune response to make a type of protein (antibodies) against influenza viruses, the viruses that cause the flu. Antibodies help your body better fight these viruses, which may help you from getting sick.

How should I store mFlusiva?

mFlusiva is usually given by a health care provider in a hospital, clinic, or pharmacy. You will not store it at home.

Side Effects

What are the most common side effects of mFlusiva?

The most common side effects of mFlusiva are listed below. Tell your health care provider if you have any of these side effects that bother you.

  • Pain, itching, swelling, or redness near the injection site
  • Tiredness
  • Headache
  • Muscle or joint pain
  • Chills or fever
  • Nausea or vomiting
  • Swelling or tenderness under the arm where you received the vaccine

There may be other side effects of mFlusiva that are not listed here. Contact your health care provider if you think you are having a side effect of a vaccine. In the U.S., you can report side effects by filling out an online form at https://vaers.hhs.gov or by calling 800-822-7967. In Canada, you can report side effects to Health Canada at www.health.gc.ca/medeffect or by calling 866-234-2345.

What are the serious side effects of mFlusiva?

While less common, the most serious side effects of mFlusiva are described below, along with what to do if they happen.

Severe Allergic Reactions. mFlusiva may cause allergic reactions, which can be serious. Get help right away if you have any of the following symptoms of a serious allergic reaction.

  • Breathing problems or wheezing
  • Racing heart
  • Fever or general ill feeling
  • Swollen lymph nodes
  • Swelling of the face, lips, mouth, tongue, or throat
  • Trouble swallowing or throat tightness
  • Itching or skin rash
  • Bumps on the skin called hives that can be red, pink, white, or brown depending on your skin tone
  • Nausea or vomiting
  • Dizziness, feeling lightheaded, or fainting
  • Stomach cramps
  • Joint pain

Warnings & Precautions

Who should not use mFlusiva?

Allergies to Ingredients. People who are allergic to any of the following should not receive mFlusiva.

  • Influenza vaccine
  • mFlusiva
  • mRNA influenza vaccine
  • Any of the ingredients in the specific product dispensed

Your pharmacist can tell you all of the ingredients in mFlusiva.

What should I know about mFlusiva before using it?

mFlusiva is usually given by a health care provider in a hospital, clinic, or pharmacy. It is given as an injection into a muscle.

mFlusiva helps protect you from serious infections caused by three strains of influenza virus. You need a flu vaccine each year because the three influenza virus strains may change. The vaccine for any given flu season contains the strains that you are most likely to be exposed to that season.

The vaccine will not give you the flu.

A vaccine information statement should be provided to you by your health care provider before each vaccination. This document provides information regarding the benefits and risks of the vaccine.

Getting mFlusiva can lower your chances of getting the flu. It does not guarantee you will not get it. Talk to your health care provider about ways to reduce your risk of getting the flu.

Your risk of dizziness or fainting, which may lead to a fall, is the highest within a few minutes after receiving the vaccine. Your health care provider may want to watch you for this time to ensure your safety.

If you are 65 or older, talk to your health care provider about the best flu vaccine options for this age group.

What should I tell my health care provider before using mFlusiva?

Tell your health care provider about all of your health conditions and any prescription or over-the-counter (OTC) medicines, vitamins/minerals, herbal products, and other supplements you are using. This will help them know if mFlusiva is right for you.

In particular, make sure that you discuss any of the following.

Current and Past Health Conditions. Tell your health care provider if you have any of the following.

  • Guillain-Barré syndrome after receiving a flu vaccine in the past
  • Severe reaction after any other vaccine
  • Have a weak immune system, get infections easily, or take medicines or treatments that suppress the immune system, such as radiation or chemotherapy
  • Fainted in the past after getting an injection

Pregnancy. People who can become pregnant are not usually given mFlusiva. Tell your health care provider if you are pregnant or plan to become pregnant.

Breastfeeding. People who can breastfeed are not usually given mFlusiva. Tell your health care provider if you are breastfeeding or plan to breastfeed.

How can I get more information about mFlusiva?

For more information about mFlusiva, you can visit the drugmaker’s website at www.modernatx.com/products or call them at 866-MODERNA or 866-663-3762.

Interactions

Does mFlusiva interact with foods or drinks?

There are no known interactions between mFlusiva and foods or drinks.

It is unknown if drinking alcohol will affect mFlusiva.

Does mFlusiva interact with other medicines (drug interactions)?

There are no known interactions between mFlusiva and other medicines. Always tell your health care provider about any prescription or over-the-counter (OTC) medicines, vitamins/minerals, herbal products, and other supplements you are using.

Does interact with other drugs you are taking?

Enter your medication into the WebMD interaction checker

Overdose/Missed Dose

What should I do if I accidentally use too much mFlusiva?

mFlusiva is given by a health care provider. Keep a record of all the vaccines you receive and share it with your health care provider.

What should I do if I miss a dose of mFlusiva?

mFlusiva is available as a once yearly flu vaccine. Keep your appointment to receive mFlusiva. If you miss an appointment to get mFlusiva, call to make another appointment as soon as possible.