Confirmed
The filler is documented in the product's own labeling.
ExampleWheat starch always contains gluten because it’s made from wheat. Lactose monohydrate always contains milk sugar.
How AllergenMaps works
Virtually Every Filler, in Every Medication, Mapped.
AllergenMaps reads FDA-listed drug labels and maps the inactive ingredients to the allergens, diets, and religious needs that matter at the point of care.
How we categorize
One Excipient, Three Categories.
Every ingredient carries one of three categories, so the signal is honest about its certainty.
Sourcing-Dependent
The ingredient depends on the manufacturer's source. Flagged for verification with the manufacturer.
ExampleMagnesium stearate can be made from beef tallow or from vegetable oils. The label rarely says which.
Cross-Contamination
Not in the formula itself, but facility-level exposure is possible.
ExampleOat-derived ingredients are gluten-free by nature, but most are processed in facilities that also handle wheat.
Not medical advice. AllergenMaps surfaces excipient data from FDA labeling and pharmacist research. It does not replace clinical judgment for a specific patient. Always verify the full excipient profile before recommending a formulation change.
How it works
From Label to Answer
We Scan Every Label
580K+ FDA-listed medications, active and discontinued.
We Normalize the Fillers
Thousands of ingredient naming variants resolve to roughly 4K unique fillers, so the same excipient reads the same on every label.
We Map and Clinically Review
Each filler is mapped to 100+ allergen, dietary, and religious categories, and the mapping is clinically reviewed before it ships.
Built on official FDA and NLM data.
Built on official FDA and NLM data.
Every Label. One Answer.
580K+
FDA-listed medications
~4K
unique fillers
100+
allergen, dietary, and religious categories
Formulation changes land on the exact product, the NDC, not just the drug name.
What we screen for
The Categories That Matter at the Counter
We map 100+ allergen, dietary, and religious categories. The most common:
- Gluten
- Alpha-Gal Syndrome
- Milk / Lactose
- Egg
- Soy
- Peanut / Tree Nut
- Fish / Shellfish
- Sesame
- Sulfites
- Dyes
- Colorants
- Sugar alcohols
- Vegan
- Halal
- Kosher
- Blood products
- Bovine-free
- Vegetarian
Sourcing-dependent excipients are flagged for manufacturer verification, and formulations are tracked per NDC on every sync.
Clinical reference
Vaccine Ingredients
Vaccine labels list two kinds of inactive material: formulation excipients, deliberately included for stability and delivery, and manufacturing process residuals, which remain after production at parts-per-million levels. The distinction matters when separating true clinical allergy from common localized reactions.
With the formulations where they appear
Antibiotic Residuals
Neomycin, streptomycin, and gentamicin are used during viral vaccine production, and trace residuals may remain at parts-per-million levels in the final product.
Found inMMR, Varicella, IPV
Gelatin
Porcine or bovine gelatin stabilizes live-attenuated vaccines during storage. Relevant for patients with gelatin allergy and for those with dietary or religious restrictions.
Found inMMR, Varicella, FluMist, Yellow Fever
Egg Proteins
Influenza and yellow fever vaccines are grown in embryonated eggs, leaving low ovalbumin residuals. Current guidance generally permits vaccination in egg-allergic patients with monitoring.
Found inFlu (most formulations), Yellow Fever
Also referenced
Thimerosal
A mercury-based preservative used in some multi-dose vials to prevent bacterial growth, and rapidly cleared from the body.
Aluminum Salts
Adjuvants that help the body build a stronger immune response. Also common in many non-medical consumer products.
Formaldehyde
Used to inactivate viruses during production. Residual amounts are significantly lower than levels naturally found in the human body.
Other excipients appear less often but still matter: polysorbate 80 (a stabilizer in mRNA and other vaccines, implicated in rare hypersensitivity reactions), yeast proteins (residual from recombinant production of hepatitis B and HPV vaccines), and MRC-5 human diploid cells (a cell culture substrate in some viral vaccines).
For professionals
Put It to Work.
For Providers
Check what’s inside any medication before it reaches the patient, and see alternatives when a filler conflicts.
- 580K+ FDA-listed medications
- 100+ allergens, dietary, and religious exclusions
- Alternatives side by side, in seconds
For Researchers
Ask formulation questions across every FDA-listed medication at once, and export answers you can cite.
- Cohorts across 580K+ drug labels
- Allergen and dietary prevalence for any cohort
- Publication-ready, reproducible exports
Common questions
Questions, Answered
Where Does the Data Come From?
Official FDA and NLM data. Which datasets we combine, and how, is part of our core work and stays in-house.
How Current Is the Data?
The database refreshes on a weekly to monthly cycle, and formulation changes land on the exact product (the NDC), not just the drug name.
How Is the Allergen Mapping Built?
Every filler is mapped to allergen, dietary, and religious categories, and each mapping is clinically reviewed before it ships. The mapping itself is our core work and stays in-house.
Do You Cover Discontinued and Repackaged Products?
Yes. Active and discontinued products are both indexed, and repackaged products inherit the formulation of the original manufacturer.
Does Patient Data Touch the Platform?
No. Lookups are by product, not by patient, and no PHI is collected or required.
I’m a Patient or Caregiver, Not a Professional. Is There a Tool for Me?
Yes. AllergenMeds is our app for patients and caregivers: look up any medication and see what’s inside. Explore AllergenMeds