Additional vaccine doses (booster shots and third doses)

Content verified November 24, 2021


Eligible people

Effective Friday, November 19, 2021, anyone 18 years and older may get a booster.

You may choose any of the available COVID-19 vaccines as your booster. If you want a specific vaccine as your booster, check that your vaccination site has it available.

Booster Shot Eligibility
If you got You can get a booster If you are
Pfizer 6 months after second dose 18 years and older
Johnson & Johnson 2 months after single dose

Available locations

Use Maryland’s vaccine locator
See County-run clinics | Make appointments

Your healthcare provider may have vaccine, too.


Items to bring to your appointment

Bring these items to your additional dose appointment

You will be required to self-certify underlying medical conditions and age.

You do not need a doctor's note or medical history.

Are there risks of receiving an additional vaccine dose?

Limited information exists about the risks of receiving an additional dose of vaccine. Ongoing research is looking at the safety and benefit of additional doses of COVID-19 vaccines.

So far, reactions reported after a third dose of an mRNA vaccine were similar to those for first and second doses. The most common side effects reported have been fatigue and pain at the injection site. Overall, most side effects have been mild to moderate.