Isn’t HCQ used for RA and Lupus? If so...interesting.
Yes - trade name Plaquenil.
It’s an anti-arthritic that has a long history of use.
And there is this..
“Cytokine storm and immunomodulatory therapy in COVID-19: Role of chloroquine and anti-IL-6 monoclonal antibodies”
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7161506/