I know many anons here don't like "E" but he posted an interesting article from a study in Spain where two nursing homes used antihistamine to treat Covid with azithromycin. Caretakers were also treated.
E suggests having some Benadril on hand.
https://t.me/TheOfficialE
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7833340/