Vaccines are not medications, but some of the same good practices apply.
Both drugs and vaccines depend on the proper dosage for their effectiveness.
as you (hopefully) read and follow the dosage instructions you are
given by your doctor or on the side of your various over-the-counter
medications, you should also follow the dosage recommendations of
If you do not get the proper amount of vaccine in your system, you will not get the desired protection.
According to the CDC:
“The two authorized and recommended vaccines to prevent COVID-19 in the United States both need two shots to be effective. There is one COVID-19 vaccine in Phase 3 clinical trials in the United States that uses one shot.”
is one other wrinkle of which you should be aware if you are getting a
multiple-dose vaccine such as the Pfizer and Moderna vaccines. You need to get your dosage at the proper interval. The Immunization Action Organization advises those who administer vaccines as follows:
the interval between doses in a 2-dose or 3-dose series will not
diminish the effectiveness of the vaccine, but may delay protection
You do not need to start a series over if a delay has occurred.
However, you should not decrease the interval for patient scheduling
convenience; this could prevent a full antibody response from
Work with your doctor to ensure that you get both doses of either the Pfizer or Moderna vaccines, and have them administered at the proper interval.