“... the drug hydroxychloroquine, which doctors have prescribed for decades to treat malaria...”
“Hydroxychloroquine is also used to treat lupus erythematosus and rheumatoid arthritis.
Chloroquine is NOT.
Chloroquine IS sometimes used for lupus. It may work when the safer first choice of hydroxychloroquine doesn’t.
Lupus patients use both. It depends on the patient more than anything else, from what I have read.