Favipiravir-based treatment for outcomes of patients with COVID-19: a systematic review and meta-analysis of randomized controlled trials.

Background: This meta-analysis of randomized controlled trials (RCTs) investigated the clinical efficacy and safety of favipiravir for patients with mild-to-critical COVID-19.

Methods: PubMed, Web of Science, Ovid Medline, Embase, and Cochrane Central Register of Controlled Trials were searched for RCTs published before 30 October 2021. Only RCTs that compared the clinical efficacy and safety of favipiravir -based antiviral regimens (study group) with other alternative treatments or placebos (control group) in patients with COVID-19 were included.

Results: Overall, the clinical improvement rate was significantly higher in the study group than in the control group at the assessment conducted after 14 days (OR, 1.83; 95% CI, 1.12-2.98). The rate of virological eradication was significantly higher in the study group than in the control group at the assessment conducted after 28 days (OR, 2.09; 95% CI, 1.15-3.78). No significant difference was observed in the rates of invasive mechanical ventilation requirement or ICU admission, mortality, or risk of an adverse event between the study and control groups.

Conclusions: Except the clinical improvement rate within 14 days and the virological eradication rate within 28 days, favipiravir-based treatment did not provide significantly additional benefit for patients with COVID-19. Therefore, more evidence is necessary.