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Vaccinations is must nowdays to get 80% more chance of safety

There are no precautionary medications to prevent covid 19 infection. However get her vaccinated, make sure she is taking nutritious diet with plenty of fluids, can take vitamin c tablets once daily for a month..practice breathing exercises / yoga. Most importantly, wear mask, sanitise hands frequently, maintain social distancing and in case she has comorbities like high BP/diabetes/thyroid problems/ asthma, these conditions should be treated at the earliest.

Take immune boosters and multi vitamin