Note: This document contains side effect information about sars-cov-2 (covid-19) mrna-1273 (6m-5y bivalent booster) vaccine. Some dosage forms listed on this page may not apply to the brand name Moderna COVID-19 (6m-5y) Bivalent Booster Vaccine PF.

Applies to sars-cov-2 (covid-19) mrna-1273 (6m-5y bivalent booster) vaccine: intramuscular suspension.

Get emergency medical help if you have signs of an allergic reaction: hives, rash; dizziness, weakness, fast heartbeats; difficult breathing; swelling of your face, lips, tongue, or throat.

Your vaccination provider may want to watch you for a short time after your shot, to make sure you don't have an allergic reaction. You will be treated quickly if you have a reaction right after you receive the vaccine.

You should not receive this vaccine if the first shot of COVID-19 vaccine caused an allergic reaction. Your doctor or vaccination provider will determine if you can safely receive this vaccine.

Not all possible side effects are known. Becoming infected with COVID-19 is much more dangerous to your health than receiving this vaccine.

Some people receiving this vaccine had inflammation of the heart muscle or the lining around the heart within a few days after receiving this vaccine, but the risk of this side effect is very low. Seek medical attention right away if you have:

• chest pain;

• shortness of breath; or

• fast or pounding heartbeats or fluttering in your chest.

Common side effects may include:

• fever, chills;

• redness or a hardness and swelling where the shot was given;

• swelling or tenderness under your arm;

• nausea, vomiting;

• feeling tired; or

• headache, muscle pain, joint pain.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects.

You may also use a smartphone-based program called V-safe to communicate with the Centers for Disease Control and Prevention (CDC) about any health problems you have after receiving a COVID-19 vaccine: www.cdc.gov/vsafe.