Why Medication Labels Do Not Have to List Allergens, and the Bill That Would Change It

If you manage a food allergy, you are used to a label that tells you plainly: “Contains milk.” Medication does not work that way. The federal food allergen labeling law covers packaged food and dietary supplements, not drugs, so neither prescription nor over-the-counter medicine has to call out milk, wheat, soy, or any other major food allergen in plain language. Drug labels are required to flag only a few specific ingredients. A bill in Congress, the ADINA Act, would change that; as of September 2026 it has not passed.

What the food allergen law requires

The Food Allergen Labeling and Consumer Protection Act of 2004, known as FALCPA, named eight major food allergens: milk, eggs, fish, crustacean shellfish, tree nuts, peanuts, wheat, and soybeans. When the law passed, those eight accounted for 90 percent of food allergies and serious allergic reactions in the US. The FASTER Act, signed on April 23, 2021, added sesame as the ninth, effective January 1, 2023.

The law requires the label to name the food source of each major allergen, either in parentheses after the ingredient, as in “lecithin (soy)” or “whey (milk),” or in a “Contains” statement next to the ingredient list. It also requires the specific type of tree nut and the species of fish or crustacean shellfish. The whole point is that you should not need to know that whey is a milk protein.

Who the law covers, and who it leaves out

The FDA enforces FALCPA in most packaged foods, and that includes dietary supplements. Our guide to allergens in vitamins and supplements covers what that does and does not guarantee.

The FDA lists the products the law does not reach, and drugs and cosmetics are on that list. That is why sesame became a major food allergen for food labels in 2023 without any change to medication labels, a gap our guide to sesame in medication looks at closely.

The few ingredients drug labels must flag

Drug regulations do single out certain ingredients for special label statements. Three matter most for allergies and sensitivities, and each has its own scope:

• FD&C Yellow No. 5 (tartrazine). Over-the-counter and prescription drugs taken by mouth, nasally, rectally, or vaginally, or used around the eye, must name it on the label. Prescription labeling must also warn that it may cause allergic-type reactions, including asthma, in certain susceptible people.
• Phenylalanine from aspartame. Because people with phenylketonuria (PKU) must carefully limit phenylalanine, over-the-counter drugs sweetened with aspartame must state “Phenylketonurics: Contains Phenylalanine” with the amount per dosage unit, and prescription labeling carries the same statement in its precautions.
• Sulfites. Prescription drugs with added sulfites must carry a warning about allergic-type reactions, including asthma episodes, regardless of the amount added. Emergency epinephrine is the one exception, and its labeling says instead that sulfites should not deter its use in an emergency.

Notice what these three have in common: none of them is one of the nine major food allergens. The rules that exist address specific ingredients and specific risks. None of them requires a drug label to tell you that an ingredient came from milk, wheat, soy, or any other food allergen.

What the gap looks like on a real label

Drug labels do list inactive ingredients. Over-the-counter Drug Facts panels name each one, and prescription labeling generally lists them in its Description section. What the label does not do is translate. An ingredient made from a food allergen appears under its ingredient name, and the allergen source may or may not be stated. You are left to know, for example, that lactose is milk sugar, or to find out which plant a starch came from. Our guide on how to read a drug label shows where those lists are and what they leave out.

The scale is not small. A 2019 study in Science Translational Medicine found that 92.8% of 42,052 oral medications contained at least one of 38 potentially allergenic inactive ingredients, with lactose in about 45%. For gluten, the FDA has so far offered only draft guidance recommending a voluntary statement, which our gluten guide covers.

The ADINA Act: what it would change

The Allergen Disclosure In Non-food Articles Act, or ADINA Act, would add a new labeling requirement to federal drug law. A drug for human use that contains an ingredient that is, or is derived directly or indirectly from, a major food allergen or a gluten-containing grain (wheat, barley, rye, and their crossbred hybrids) would have to say so on its label, and identify each such ingredient and the type of grain. The requirement would take effect on a date set by the Secretary of Health and Human Services, or two years after enactment, whichever comes first.

Versions of the bill were introduced in both the House and the Senate in 2023 and did not advance beyond committee. The current version, H.R.3821, was introduced in the House on June 6, 2025, with cosponsors from both parties, and referred to the Committee on Energy and Commerce. As of September 2026, Congress.gov lists no action on it since that referral. It is a proposal, not the law.

How to check in the meantime

• Read the inactive ingredients on the Drug Facts panel or in the prescribing information, and look for the warnings above where they apply.
• Ask your pharmacist to check a specific allergen against the exact product, and name the allergen rather than asking whether it is “safe.”
• Call the manufacturer when an ingredient’s source is unclear. The company is best placed to say where its lactose, starch, or lecithin came from.
• Check the product in the app. The AllergenMeds app flags ingredients like these in the exact product you look up, so the label’s silence does not have to be the last word.

This guide is for education only, not medical advice. Always talk to your doctor or pharmacist before starting, stopping, or switching any medication.