Although the database is not a probability-based sample, it bears sufficient similarity to a probability-based sample of pediatric hospitalizations (HCUP KID) to serve as a starting point in developing national estimates of inpatient pediatric medication use. Over 500 drug entities were administered to hospitalized children, but most are used by small percentages of hospitalized patients. The small numbers of children using any one drug has implications for efforts to study efficacy and safety, describe off-label use, monitor adverse events, describe practice, and conduct comparative effectiveness research.