Antibiotic burden is not evenly distributed
Outpatient antibiotic use is common across childhood, but a new national analysis suggests one group stands out sharply from the rest: children with medical complexity. Researchers from Boston Children’s Hospital found that annual antibiotic prescription rates increased nonlinearly as children’s underlying level of medical complexity rose, with the highest burden falling on those with three or more complex chronic conditions.
The findings were presented at the Pediatric Academic Societies 2026 Meeting in Boston and point to a population that may deserve much closer attention in antibiotic stewardship efforts. According to the study, children with multiple complex chronic conditions were not only more likely to fill antibiotic prescriptions, but were also more likely to receive broad-spectrum antibiotics with less favorable safety profiles.
That matters because frequent antibiotic exposure carries well-known risks. These include antibiotic-related complications such as
C. difficile
infection, along with the broader public health danger of antibiotic resistance. Overuse and misuse have long been recognized as drivers of resistant infections. What this study adds is a clearer picture of just how concentrated that exposure may be among medically complex children.A national look at Medicaid prescription claims
The research team conducted a retrospective cohort study using the multistate MarketScan Medicaid Database. They examined outpatient antibiotic prescription claims among children ages 0 to 18 who were continuously enrolled in Medicaid during 2023. The children were grouped into five mutually exclusive categories of underlying medical complexity.
Across the entire study population, antibiotic use was widespread. More than a third of children filled at least one antibiotic prescription in 2023, according to lead author Kathleen D. Snow of Boston Children’s Hospital. But the averages concealed a striking gradient. As complexity increased, so did prescription fill rates, total annual antibiotic exposure, and use of broader-spectrum drug classes.
The most medically complex children had the highest annual prescription rates of any population group, adult or pediatric, cited by the study. That is an extraordinary benchmark. It suggests that medically complex children are not simply another subgroup within the broader stewardship conversation. They may be one of the most antibiotic-exposed populations in the health system.



