Polyethylene glycol (PEG) is a cause of anaphylaxis to the …
Allergy to PEG is rare, 5, 6 but reactions can be severe or even fatal. 7 PEG is an excipient of many drugs, but hypersensitivity depends on its molecular weight (MW). A 52‐year‐old woman developed throat constriction, cough and then loss of consciousness immediately after receiving the Pfizer/BioNTech COVID‐19 vaccine.