Volunteers who received the Pfizer coronavirus vaccine have said it left them with side effects that felt similar to a “severe hangover,” according to a new report.
The reports of side effects caused by the vaccine, which has so far proven safe, comes days after Pfizer and its German partner BioNTech announced the vaccination was 90 per cent effective in preventing coronavirus, with the drug companies expected to seek US emergency use authorisation this month.
During the trials, the more than 43,500 volunteers from six countries were not informed whether they received the vaccine or a placebo.
However, some volunteers reportedly said they were able to tell they had received the vaccine because of certain side effects such as headaches and muscle aches.