Give a brief overview of the drug and how it works in all phases of Covid, give them the leaflet, ask them to check it out, tell them if they're convinced, to spread the word on their rounds.
https://bird-group.org/wp-content/uploads/2021/05/a5-flyer-email-29apr21.pdf
You can also make QR stickers that point to an archived version of it and plaster everywhere.