RESUMEN
Background: Coronavirus disease 2019 (COVID-19) was recognized by the World Health Organization (WHO) as a global pandemic on March 11, 2020. Since then, researchers worldwide have focused their attention on identifying effective treatments and developing vaccines to combat this disease. Aim: To report the effectiveness of the drugs employed in the COVID-19 treatment protocols based on data from clinical trial studies conducted from the beginning of the pandemic until December 10, 2020. Methods: Following the PRISMA guidelines, we conducted an advanced search in several electronic databases. A total of 13553 studies was screened by two people simultaneously and separately based on the article title, and full-text. The quality of the studies was evaluated using the Cochrane criteria. Results: Of the 13553 studies identified, 50 clinical trials were included in this systematic review. Of these, three studies explored the use of remdesivir, nine studies the use of hydroxychloroquine, five studies the use of lopinavir/ritonavir, six studies the use of favipiravir, one study the use of tocilizumab, two studies the use of interferon beta-1a and two studies the use of umifenovir.