Hydroxychloroquine (HCQ) is a medication usually prescribed to prevent and treat malaria. It is also used to treat chronic skin inflammation and arthritis in patients whose symptoms have not improved with other treatments. Many countries have authorised the hospital use of HCQ or its use in clinical studies under the supervision of healthcare professionals. The drug is in the list of World Health Organization's essential medicines. In the context of the coronavirus pandemic, HCQ was touted to be effective and approved for use as a prophylactic drug by several countries, including India.