Updated October 23, 2026 · DailyMed checked live, re-rendered every 12 hours · 10 medications · 100 product labels screened

Most-searched medications: gluten-free status, 2026 edition

By Ned Walsch

Founder and maintainer of Gluten Screen

Updated October 23, 2026 · what changed

Not clinically reviewed — verify with your pharmacist

Gluten Screen is a free medication-screening tool that cross-references any prescription or over-the-counter drug against four authoritative sources — DailyMed (the FDA’s Structured Product Label repository), the European Medicines Agency, the Plogsted curated list, and the Matson et al. 2025 pediatric NDC study. This page is the rolled-up answer across ten high-volume US medicines — a selection the maintainer chose for prescription volume and search interest, not a measured ranking.

Each entry is a live cross-check, not a static snapshot: the classifier runs against DailyMed label data cached for up to seven days, and the page is re-rendered at most every twelve hours.

Quick answer

Of the 10 most-searched US medications, we screened 100 distinct product labels across all four data sources. 5 drugs require manufacturer-by-manufacturer verification because of source-ambiguous starches. 5 drugs had multiple manufacturer attestations on the label. 0 drugs cleared every label we checked without a single flag.

5 verify with maker 5 attested gluten-free

How we screened these

For each drug we pulled every indexed product label from DailyMed (FDA Structured Product Labels), supplemented with the corresponding EU centrally-authorised leaflets when present. Each label’s inactive-ingredients list was scanned against a 163-entry red-flag dictionary (489 name patterns, 155 FDA UNII codes) covering wheat-, barley-, rye-, and malt-derived excipients plus source-ambiguous starches (pregelatinized starch, modified starch, dextrates without source qualifier) and FDA gluten-free attestation phrases. Plogsted’s curated list (structured list last updated 23 April 2019) and the Matson et al. 2025 pediatric NDC study layered in cross-references. The verdict prose under each entry is the same classifier that powers the per-drug pages — not a hand-edited summary. Full methodology →

01

Is Lipitor gluten-free?
Manufacturer-attested gluten-free

Multiple manufacturers attest gluten-free. Of 4 labels, 1 explicitly declare gluten-free status on the label and the rest cleared with no red flags.

Brand atorvastatin. The generic is made by many manufacturers, so the dispensed label can change between fills.
See the per-manufacturer breakdown →
02

Is Synthroid gluten-free?
Manufacturer-attested gluten-free

Multiple manufacturers attest gluten-free. Of 10 labels, 2 explicitly declare gluten-free status on the label and the rest cleared with no red flags.

Brand levothyroxine. Thyroid medicines are commonly taken long-term, and levothyroxine generics come from several manufacturers.
See the per-manufacturer breakdown →
03

Is Tylenol gluten-free?
Verify with your specific manufacturer

Manufacturer-by-manufacturer call. Of 16 labels, 15 cleared without flags and 1 contain source-ambiguous starches that warrant a verification call to the maker.

Brand acetaminophen, sold in tablet, capsule, chewable and liquid forms whose inactive ingredients differ from one another.
See the per-manufacturer breakdown →
04

Is metformin gluten-free?
Verify with your specific manufacturer

Manufacturer-by-manufacturer call. Of 14 labels, 12 cleared without flags and 2 contain source-ambiguous starches that warrant a verification call to the maker.

Generic type-2 diabetes medicine with many manufacturers; pharmacy substitution between them is routine.
See the per-manufacturer breakdown →
05

Is Adderall gluten-free?
Verify with your specific manufacturer

Manufacturer-by-manufacturer call. Of 6 labels, 4 cleared without flags and 2 contain source-ambiguous starches that warrant a verification call to the maker.

Brand amphetamine salts. Supply shortages have meant pharmacies dispense whichever manufacturer is available, so the label can change.
See the per-manufacturer breakdown →
06

Is ibuprofen gluten-free?
Verify with your specific manufacturer

Manufacturer-by-manufacturer call. Of 18 labels, 10 cleared without flags and 8 contain source-ambiguous starches that warrant a verification call to the maker.

OTC and prescription strengths, tablets, chewables and suspensions — each filed as a separate label with its own inactive ingredients.
See the per-manufacturer breakdown →
07

Is Zyrtec gluten-free?
Manufacturer-attested gluten-free

Multiple manufacturers attest gluten-free. Of 10 labels, 2 explicitly declare gluten-free status on the label and the rest cleared with no red flags.

Brand cetirizine, an OTC antihistamine sold in tablet, chewable, dissolving and liquid forms.
See the per-manufacturer breakdown →
08

Is Lexapro gluten-free?
Manufacturer-attested gluten-free

Multiple manufacturers attest gluten-free. Of 6 labels, 1 explicitly declare gluten-free status on the label and the rest cleared with no red flags.

Brand escitalopram. Generic escitalopram from different makers can list different starches and fillers.
See the per-manufacturer breakdown →
09

Is Prilosec gluten-free?
Manufacturer-attested gluten-free

Multiple manufacturers attest gluten-free. Of 8 labels, 1 explicitly declare gluten-free status on the label and the rest cleared with no red flags.

Brand omeprazole, an OTC proton-pump inhibitor whose delayed-release pellets use coating excipients worth reading.
See the per-manufacturer breakdown →
10

Is Singulair gluten-free?
Verify with your specific manufacturer

Manufacturer-by-manufacturer call. Of 8 labels, 5 cleared without flags and 3 contain source-ambiguous starches that warrant a verification call to the maker.

Brand montelukast, sold as film-coated tablets, chewable tablets and granules — three labels, three excipient lists.
See the per-manufacturer breakdown →

Patterns we noticed

The manufacturer changes gluten status; the drug does not. Wherever a drug above has a split verdict, it is because different labels for the same molecule list different excipients. The active ingredient is identical across them. That is why each verdict is per manufacturer, and why re-screening after a refill from a different maker is the single most useful habit.

Dosage form is not a safe proxy. Liquids, chewables and tablets of the same drug are filed as separate labels and should be read separately, but the data do not support assuming liquids are riskier: in Matson et al. 2025, eight of the nine named gluten-containing NDCs were tablets or capsules, and in the Portuguese SmPC study (Figueiredo et al. 2025) solid analgesics carried gluten-derived excipients more often than liquids (51.2% vs 40%).

The US and EU differ in vocabulary more than in disclosure. EU rules require a quantitative gluten declaration when wheat starch is used; US rules are voluntary. In practice our census of 1,777 EU centrally-authorised products (October 2026) found zero declaring wheat starch, and across 125 paired molecules the US label named the starch source for 86.4% against 42.4% on the EU leaflet. FDA’s controlled ingredient names carry the source; EU free text often does not.

What this means in practice

For any drug on this list with a “verify with your specific manufacturer” verdict, the practical workflow is: identify the manufacturer dispensed on your current bottle (it’s on the prescription label, usually labelled “Mfr” or “Manufactured by”), look up that specific NDC code on its per-drug page, and call the manufacturer’s medical-information line if the verdict for that specific label is still ambiguous. Most manufacturer med-info lines will provide a written gluten-free attestation by email if you call and ask, which is a useful artifact to have on file if the pharmacy substitutes again.

Questions this page answers

Which excipients on these labels are the usual reason for a flag?

Across the ten drugs on this page, flags come almost entirely from starches whose botanical source the label does not state — plain "starch", pregelatinized starch, sodium starch glycolate — and from the rare label that names wheat, barley, rye or malt outright. A starch with a stated corn, potato, tapioca or rice source is not flagged. The source matters because US labels are not required to give it.

Are generic medications more likely to contain gluten than brand-name versions?

Not categorically, but they vary more. In the US, generics must use the same active ingredient as the brand but are not required to use the same inactive ingredients, so two generics of the same drug can list different starches, binders and fillers. Pharmacies may also switch manufacturers between fills without telling the patient, which is why a drug cleared once may need re-screening after a refill.

How often should I re-check whether my medication is gluten-free?

Whenever the manufacturer on your pharmacy label changes, when you move to a different form or strength, and after a label revision. Gluten Screen re-checks labels it has already screened against DailyMed's change feed about every four hours, so searching again after a manufacturer switch is cheap.

What does 'pregelatinized starch' mean on a drug label?

Pregelatinized starch is a physically modified starch used as a binder and disintegrant in tablets. Its source can be corn, potato, tapioca or rice (all gluten-free) or wheat (contains gluten), and US labels are not required to say which. When it appears without a source, the only definitive check is the manufacturer's medical-information line, quoting the NDC on the bottle.

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