• The Moderna COVID‑19 Vaccine has not been approved or licensed by the US Food and Drug Administration (FDA), but has been authorized for emergency use by FDA, under an Emergency Use Authorization (EUA), to prevent Coronavirus Disease 2019 (COVID‑19) for use in individuals 18 years of age and older.
  • The EUA for the Moderna COVID‑19 Vaccine is in effect for the duration of the COVID‑19 EUA declaration justifying emergency use of the vaccine, unless terminated or revoked (after which the vaccine may no longer be used).
A diverse group of over 15,000 people

How Many People Have Received the Vaccine in the Clinical Trials?

In clinical trials, approximately 15,400 individuals 18 years of age and older have received at least 1 dose of the Moderna COVID‑19 Vaccine.

In the largest trial, about 25% of trial participants were 65 years of age and older. About 21% were Hispanic or Latino and 10% were Black.

According to the CDC, as of June 1, 2021, more than 124 million doses of Moderna COVID‑19 Vaccine have been administered in the US, and 54 million people have received the full 2‑dose series.

What Is Known About the Safety of the Vaccine?

Side effects that have been reported with the Moderna COVID‑19 Vaccine include:

  • Injection site reactions: pain, tenderness and swelling of the lymph nodes in the same arm of the injection, swelling (hardness), and redness
  • General side effects: fatigue, headache, muscle pain, joint pain, chills, nausea and vomiting, and fever

Side effects that have been reported during post‑authorization use of the Moderna COVID‑19 Vaccine include:

  • Severe allergic reactions

There is a remote chance that the Moderna COVID‑19 Vaccine could cause a severe allergic reaction. A severe allergic reaction would usually occur within a few minutes to one hour after getting a dose of the Moderna COVID‑19 Vaccine. For this reason, your vaccination provider may ask you to stay at the place where you received your vaccine for monitoring after vaccination. Signs of a severe allergic reaction can include:

  • Difficulty breathing
  • Swelling of your face and throat
  • A fast heartbeat
  • A bad rash all over your body
  • Dizziness and weakness

These may not be all the possible side effects of the Moderna COVID‑19 Vaccine. Serious and unexpected side effects may occur. The Moderna COVID‑19 Vaccine is still being studied in clinical trials.

Learn about what to expect with vaccination

What Should I Do if I Have a Side Effect?

If you experience a severe allergic reaction, call 9‑1‑1, or go to the nearest hospital.

Call your vaccination provider or your healthcare provider if you have any side effects that bother you or do not go away.

Report vaccine side effects to FDA/CDC Vaccine Adverse Event Reporting System (VAERS). The VAERS toll-free number is 1‑800‑822‑7967 or report online to https://vaers.hhs.gov/reportevent.html. Please include “Moderna COVID‑19 Vaccine EUA” in the first line of box #18 of the report form.

In addition, you can report side effects to Moderna at 1-866-MODERNA (1‑866‑663‑3762).

You may also be given an option to enroll in v-safe. V-safe is a new voluntary smartphone-based tool that uses text messaging and web surveys to check in with people who have been vaccinated to identify potential side effects after COVID‑19 vaccination. V-safe asks questions that help CDC monitor the safety of COVID‑19 vaccines. V-safe also provides second-dose reminders if needed and live telephone follow-up by CDC if participants report a significant health impact following COVID‑19 vaccination. For more information on how to sign up, visit: www.cdc.gov/vsafe.