Data sources
Formulary Signal monitors public FDA/openFDA shortage data. Signal Cards can attach related public context from FDA RSS, RxNorm, openFDA NDC, DailyMed, and ASHP link-only references where available. It is not affiliated with the FDA.
Methodology
How Formulary Signal turns public changes into Signal Cards.
Formulary Signal exists to make the public-record monitoring workflow explainable: scheduled checks, watchlist matching, timestamped Signal Cards, and source context from public sources where matching records are available.
Monitoring
Records are checked on a scheduled basis. Alerts are generated when matching watchlist terms appear, change, or resolve, depending on configured alert behavior. The service is not real-time.
Source context
Alerts include timestamp, match type, source count, public-record links, and matched public-source context so customers can verify against official public sources.
Empty states
Not every source produces related context for every watch term. When no related public context is found in a source, the Signal Card says so instead of implying a missing check failed.
Limitations
Formulary Signal does not replace official sources. It does not provide clinical, procurement, inventory, sourcing, substitution, causality, or legal advice.