Observational study: Risk of hydroxychloroquine alone and in combination with azithromycin in the treatment of rheumatoid arthritis 26 Aug, 2020 | 03:57h | UTC Risk of hydroxychloroquine alone and in combination with azithromycin in the treatment of rheumatoid arthritis: a multinational, retrospective study – The Lancet Rheumatology Commentary: Hydroxychloroquine plus azithromycin increases heart risk, finds global study – Columbia University Irving Medical Center