In the event of a large-scale earthquake disaster, it is necessary to respond to diverse medical needs and effectively utilize limited medical resources. Among these, if the medical response to chronic drug users is delayed, the condition may become more severe and lives may be at risk. It is considered possible to provide prompt and accurate pharmaceutical support at the time of a disaster by understanding the local demand for pharmaceuticals during normal times. In this study, targeting the city of Hakui in Ishikawa Prefecture, using the National Health Insurance database, which enables the identification of prescribed medicines for each individual, we calculated the number of users of chronically needed medicines for each town and city. As a result, it was possible to identify the pharmaceutical needs in Hakui at the time of a disaster on a per-town character basis.