Most people with allergies (including food or penicillin allergies) can be vaccinated against COVID-19.
Tell healthcare staff before you're vaccinated if you've ever had a serious allergic reaction (including anaphylaxis). They may ask what you're allergic to, to make sure you can have the vaccine.
Serious allergic reactions to the COVID-19 vaccines are very rare.
If you do have a reaction, it usually happens in minutes. Staff giving the vaccine are trained to deal with allergic reactions and treat them immediately.
If you have a serious allergic reaction to the 1st dose of a vaccine, you should not have the same vaccine for your 2nd dose.