Some studies suggest that proton-pump inhibitors (PPIs) increase risk for community-acquired pneumonia (CAP). In this large,
nested case–control study of adults in general practices in the United Kingdom, long-term PPI use was not associated with
increased risk for CAP. However, recently started PPI therapy was associated with increased CAP risk: The adjusted odds ratios
for CAP occurring after starting PPIs within 2, 7, and 14 days of CAP diagnosis were 6.5, 3.8, and 3.2, respectively.