Healthcare Is hydroxychloroquine-azithromycin combination a cure for COVID-19? What experts say Updated : May 11, 2020 06:25 PM IST Hydroxychloroquine or HCQS is used to treat malaria and other conditions such as arthritis and lupus. hydroxychloroquine is also a part of the World Health Organisation’s list of ‘essential medicines’. HCQS is being used as a prophylactic or preventive medicine among COVID-19 exposed healthcare workers. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.