Free tool · Privacy-first · Sourced from FDA

Drug interaction checker

Add the medications you take. We'll cross-check each pair against FDA drug labels and flag anything worth asking your pharmacist about. Your list never leaves your browser — every lookup runs through our privacy proxy and is never logged.

🔒 Sourced from openFDA. Drug names are queried via our privacy proxy and never logged.

Add at least two medications to begin.

About this tool

Where does the data come from?

Every result is pulled live from openFDA, the U.S. Food and Drug Administration's public API for Structured Product Labels. These are the same documents your pharmacist consults. We add no editorial layer — the excerpts shown are quoted directly from the FDA-approved drug label.

Why might a real interaction not be listed?

FDA labels reflect the manufacturer's submitted data and the FDA's review at the time of approval. Newly-discovered interactions, off-label combinations, and food/supplement interactions are often missing. International (non-FDA) drugs may have no entry at all. Always confirm with a pharmacist for anything safety-critical.

Is anything stored about my search?

No. Our server-side proxy receives the drug names, queries openFDA on your behalf, and discards the request after returning results. We don't log, we don't fingerprint, we don't have an analytics SDK on this page. The only optional persistence is the URL — if you click "Copy shareable link," your drug list is encoded into the URL itself so you can save it. Nothing leaves your browser otherwise.

How accurate is the substring matching?

We use word-boundary regex matching (so "aspirin" doesn't match inside "diaspirin") and we search both directions for each pair (does drug A's label mention B, or does B's label mention A). Results are pairwise — for three drugs, you'll see up to three findings. Triple-interaction analysis requires clinical-grade pharmacology software and isn't appropriate for a free tool.

What's the relationship to the PillMe app?

The PillMe app is a privacy-first medication reminder for iOS and Android. It uses the same openFDA data source for its in-app interaction warnings, but stores everything locally on your phone — no servers, no accounts, no cloud. This web tool is free and shares the same privacy values.