how COVID-19 vaccines work and get a better understanding of COVID-19 mRNA vaccines. 2 shots, 21 days apart Shot in the muscle of the upper armFor a full list of ingredients, see Pfizer’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 Pfizer-BioNTech vaccine.
Your doctor will help you decide if it is safe for you to get the Pfizer-BioNTech vaccine. These side effects usually start within a day or two of getting the vaccine.
They might feel like flu symptoms and might even affect your ability to do daily activities, but they should go away in a few days.