ST. LOUIS ( - As more people receive the COVID-19 vaccine, some have have expressed concerns about allergic reactions to the shot.

Doctors say such reactions are rare and typically happen within 15-20 minutes of the vaccine being given. The reaction manifests as hives, swelling of the lips, throat or eyes.

Dr. Jennifer Monroy with BJC says people with food or seasonal allergies shouldn't be worried. There is a particular ingredient being looked at as the cause of some of the reported reactions.

"Polyethelyne glycol or PEG is an ingredient that's found in everyday products, make up, the more common product is Miralax. So, if a patient can take Miralax for their constipation, they're probably going to do just fine with the vaccine," said Dr. Monroy.

Dr. Monroy says that PEG helps protect the vaccine once its in your body so your immune system has time to build a response.

If you've had an allergic reaction to vaccines in the past, Dr. Monroy says its probably a good idea to talk to your doctor before getting the COVID-19 shot.

Copyright 2021 KMOV (Meredith Corporation). All rights reserved

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