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Hello. This is Dr Geyik and I will be assisting you today.
Can I ask if you have any allergic reaction now?
Pfizer vaccine does not contain any penicillin so you shouldn’t get any reaction. Therefore, you don’t need Piriton.
If you have any itching, you can take Pititon and this doesn’t interact with Pfizer.
If you get any more serious reaction such as rash, swelling or breathing difficulties, you should call 999 or 111 now.