People have been saying, correctly, that hydroxychloroquine has been used safely for years for rheumatoid arthritis, lupus and malaria,but and that's a great big BUT, the dosage being recommended for COVID 19 is 5-10 times higher than traditional usage, at least that what it say in the PDF of the study I linked to above, in fact the recommended COVID dose is something like one half of what is considered a lethal dose of chloroquine, food for thought.