ABSTRACT
The findings of previous research on the association between proton pump inhibitor (PPI) use and the treatment and prevention of coronavirus disease 2019 (COVID-19) are inconsistent. Therefore, this meta-analysis was conducted to clarify the outcomes of patients taking PPIs. This analysis included 14 articles with more than 268,683 subjects. PPI use was not associated with increased or decreased risk of COVID-19 infection (odds ratio [OR] 1.64, 95% confidence interval [CI] = 0.54-5.00, P = 0.39) or mortality (OR = 1.91, 95% CI = 0.86-4.24, P = 0.11). However, PPI use increased the risks of severe disease (OR 1.67, 95% CI = 1.37-2.02, P < 0.00001) and secondary infection (OR 4.62, 95% CI = 2.55-8.39, P < 0.00001). In summary, PPI use was not associated with an increased risk of infection and mortality in COVID-19 but appeared to be associated with an increased risk of progression to severe disease and secondary infection. However, more original studies are urgently needed to further clarify the relationship between PPI use and COVID-19.