how COVID-19 vaccines work and get a better understanding of COVID-19 mRNA vaccines. 2 shots, one month (28 days) apart Shot in the muscle of the upper armFor a full list of ingredients, see Moderna’s COVID-19 Vaccine Fact Sheet for Recipients and Caregiversexternal icon.*If you have had a severe allergic reaction to other vaccines or injectable therapies, ask your doctor if you should get the Moderna vaccine.
Your doctor will help you decide if it is safe for you to get the Moderna vaccine.In the arm where you got the shot:Throughout the rest of your body:These side effects usually start within a day or two of getting the vaccine.