Hydroxychloroquine is virtually the same as chloroquine - so that's why our so-called "autoimmune" conditions respond to it!
http://www.nature.com/icb/journal/v92/n2/abs/icb201373a.html?WT.ec_id=ICB-201402
http://www.nature.com/icb/journal/v92/n2/abs/icb201373a.html?WT.ec_id=ICB-201402