A day after the WHO suspended testing of hydroxychloroquine for Covid-19 patients, the Indian Council of Medical Research (ICMR) said the use of the drug as a prophylaxis has been approved based on observational studies in India, which have indicated anti-viral properties with no major side-effects.A day after the WHO suspended testing of hydroxychloroquine for Covid-19 patients, the Indian Council of Medical Research (ICMR) said the use of the drug as a prophylaxis has been approved based on observational studies in India, which have indicated anti-viral properties with no major side-effects.