Real-World Safety Profile of Proton Pump Inhibitors in Infants as Reported in the FDA Adverse Event Reporting System (FAERS): Tiny Tummies, Key Decisions.

: Proton pump inhibitors (PPIs) are widely used for gastric acid suppression, yet their efficacy and safety in neonates and infants remain unclear. While esomeprazole is the only Food and Drug Administration (FDA)-approved PPI for neonates and infants under 1 year of age, other PPIs are also frequently prescribed. : This study utilizes FDA Adverse Event Reporting System (FAERS) data to evaluate potential adverse drug events (ADEs) of PPIs, providing crucial real-world insights into their safety in this vulnerable population. : This observational cross-sectional study was conducted using an individual case safety report (ICSR) database. Only reports in neonates or infants receiving omeprazole, pantoprazole, lansoprazole, rabeprazole, or esomeprazole monotherapy were evaluated. The most frequently prescribed PPI, the most common indication, the most reported ADE, the seriousness of AEs, and the countries reporting the highest ADE number were analyzed using 2D disproportionality analyses (e.g., reporting odds ratio (RORs)). : A total of 464 patients were included; 323 (69.6%) of them were stated as serious and 15 (3.2%) of them were stated as time-related to mortality. Most of the ADEs were reported for lansoprazole (45.9%). The most reported PPI-associated ADE was vomiting (8.8%). According to the RORs analysis, vomiting associated with PPI monotherapy was more likely to occur (RORs: 2.88, 95% CI: 2.09-3.96), which is followed by diarrhea, hypertrichosis, choking, and erythema. Additionally, medication errors were reported in 50 (10.8%) patients. : ICSR databases are valuable pharmacovigilance tools. The absence of access to a causality assessment is a limitation since it limits its ability to confirm whether the ADEs are truly caused by the suspected drug, mitigated using RORs analysis. Integrating neonatal-specific algorithms could enhance drug safety evaluations, strengthen evidence-based decision-making, and improve risk-benefit assessments in neonates and infants.