For people with MCAS
Check a medication's inactive ingredients
Scan the barcode on the box, enter the NDC, or search by name. We read the official FDA label, point out ingredients some people react to, and show other manufacturers of the same drug that use fewer of them.
The NDC is the 10 or 11 digit code on the box, bottle or pharmacy label, often written like 0093-0147-01.
1. Find the product
Every manufacturer’s version of a generic has its own NDC and its own recipe of inactive ingredients.
2. Check the label
We read the inactive ingredients from the product’s FDA label on DailyMed and flag ones with published reports of reactions.
3. Compare
We list other manufacturers of the same drug, strength and form, ranked by how many flagged ingredients they contain.
Before you change anything
Reactions are individual. A flagged ingredient is not necessarily a problem for you, and an unflagged product is not guaranteed to be safe. Bring what you find here to your pharmacist, who can often order a specific manufacturer's version for you. How we decide what to flag.
More from MCAS organizations
- The Mastocytosis Society (TMS)
Patient guides, emergency protocols and trigger information.
- Mast Cell Action (UK)
Information on MCAS triggers and self-management.
- MastAttack
Guidance documents and provider primers.
- Swiss Interest Group Histamine Intolerance (SIGHI)
Food compatibility list for histamine intolerance.