COVID-19 vaccine (COVID-19 vaccine (various types: mRNA, viral vector, protein subunit, inactivated virus)) — Uses, Dosage, Side Effects & Safety

Drug class: Vaccine (Immunization agent)

Overview

The COVID-19 vaccine is used to help protect against coronavirus disease 2019 (COVID-19), a potentially serious respiratory illness caused by the SARS-CoV-2 virus. Vaccines work by training your immune system to recognize and fight the virus if you are exposed in the future. COVID-19 vaccines do not contain live coronavirus and cannot give you COVID-19. They use different technologies, such as mRNA, viral vectors, protein subunits, or inactivated virus, to stimulate your body’s immune response. Most people receive the vaccine as an injection in the upper arm. Key points: COVID-19 vaccines are highly effective at reducing the risk of severe illness, hospitalization, and death from COVID-19. Side effects are usually mild and temporary. Staying up to date with recommended doses and boosters is important for continued protection.

Therapeutic uses

  • Prevention of COVID-19
  • Immunization

For related COVID-19 vaccine guidance, compare Zoster vaccine.

Common side effects

  • Pain at injection site
  • Fatigue
  • Headache
  • Muscle aches
  • Fever
  • Chills
  • Swollen lymph nodes
  • Myocarditis

Frequently Asked Questions about COVID-19 vaccine

How effective are COVID-19 vaccines?

COVID-19 vaccines are highly effective at preventing severe illness, hospitalization, and death. Effectiveness may vary depending on the vaccine type, age, and circulating variants.

Can I get COVID-19 from the vaccine?

No, COVID-19 vaccines do not contain live virus and cannot cause COVID-19.

Who should not get the COVID-19 vaccine?

People with a history of severe allergic reaction to a previous COVID-19 vaccine dose or any component of the vaccine should not receive it.

What should I do if I have side effects?

Mild side effects are common and usually resolve in a few days. Use over-the-counter pain relievers if needed. Seek medical attention for severe or persistent symptoms.

Do I need a booster dose?

Booster doses are recommended for most people to maintain protection, especially as immunity may decrease over time. Follow your local health authority’s guidance.

Is the vaccine safe during pregnancy or breastfeeding?

Current evidence suggests COVID-19 vaccines are safe and effective during pregnancy and breastfeeding. Discuss with your healthcare provider for personalized advice.

Can children get the COVID-19 vaccine?

Yes, COVID-19 vaccines are approved for children in many countries, with age-appropriate dosing and schedules.

Educational information only. Always consult a qualified healthcare professional before starting, stopping, or changing any medication.