In July, the Central Drugs Standard Control Organisation of India’s Directorate General of Health Services approved Favipiravir for distribution,
sale and use in treatment of COVID-19 patients.
http://www.maritimegateway.com/india-approves-avigan-favipiravir-covid-19-treatment/

インフルエンザ予防薬もアビガンも数日の症状改善だし、同じような効果で予防薬承認だぞ。