Although the evidence is limited, some painkillers might interfere with the very thing the vaccine is trying to do: generate a strong immune system response.
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But in order for people to have a choice, you are going to say that I need to have perhaps 5 million doses of the Moderna, 5 million doses of Pfizer and 5 million doses of Sinovac, just in case people want to choose one or the other.
Or if they have swelling around their face, lips, eyes, throat, we would advise them to hold off for now, until we get more data and let other people get vaccinated first.
Dr Xie has also seen more younger patients than older ones, particularly women in their 20s and 30s.
If your symptoms get worse or you are worried, call 111.