Some politicians and doctors are sparring over whether to use hydroxychloroquine against the new coronavirus, with many scientists saying the evidence is too thin to recommend it now.
The drug can help tame an overactive immune system. It’s been used since the 1940s to prevent and treat malaria, and to treat rheumatoid arthritis and lupus.
It’s sold in generic form and under the brand name Plaquenil in the United States. Doctors also can prescribe it “off label” for other purposes, as many are doing now for COVID-19.
Some small and very preliminary studies give conflicting results. One lab study suggested it curbed the virus’ ability to enter cells.