Inactive ingredients by manufacturer

Zileuton inactive ingredients by manufacturer

Wondering whether your Zileuton has lactose, gluten, soy, a dye or gelatin in it? The medicine is the same, but the fillers, coatings and colors differ from one company to the next. This page shows what each Zileuton product's FDA label lists, so you can find a version that leaves out what you avoid and ask your pharmacist for it by its NDC.

We have read the FDA labels of 6 of the 6 current Zileuton products on the market today, from 6 companies listing it with the FDA, and lined them up side by side.

Ask about your bottle

Is there something in your Zileuton? Ask in plain words.

Name the company, strength or the NDC on your bottle and the ingredient you avoid. The answer comes only from the FDA labels on this page.

Answers are drawn from the FDA label data on this page and checked against it. They are not medical advice: confirm with your pharmacist before relying on them.

The short answer

Which Zileuton products list lactose, a gluten source, soy, dyes or gelatin?

  1. LactoseNo checked product

    No checked Zileuton product lists lactose.

  2. Wheat or gluten sourceNo checked product

    No checked Zileuton product lists a wheat or gluten source.

  3. SoyNo checked product

    No checked Zileuton product lists soy.

  4. Synthetic dyesNo checked product

    No checked Zileuton product lists synthetic dyes.

  5. GelatinNo checked product

    No checked Zileuton product lists gelatin.

Also listed by some products: Corn 6 of 6 Titanium dioxide 2 of 6 Propylene glycol 1 of 6 PEG or polysorbate 5 of 6 Sorbitol or mannitol 5 of 6

Find a version without it

Every current Zileuton product and what its label lists

Hide products that list:

ProductListsInactive ingredients on the label
Camber Pharmaceuticals, Inc. 1 product
600 mg extended-release tabletNDC 31722-0044-12 Corn-derived Polyethylene glycol or polysorbate Sorbitol or mannitol
Show 15 ingredients

CROSPOVIDONE, FERRIC OXIDE RED, HYDROXYPROPYL CELLULOSE, UNSPECIFIED, HYPROMELLOSE 2208 (100000 MPA.S), HYPROMELLOSE 2208 (15000 MPA.S), HYPROMELLOSE 2910 (5 MPA.S), MAGNESIUM STEARATE, MANNITOL, MICROCRYSTALLINE CELLULOSE, POLYETHYLENE GLYCOL 400, POLYETHYLENE GLYCOL 6000, SILICON DIOXIDE, SODIUM LAURYL SULFATE, SODIUM STARCH GLYCOLATE TYPE A POTATO, STARCH, CORN
Chiesi USA, Inc. 1 product
600 mg tabletNDC 10122-0901-12 Corn-derived Titanium dioxide Propylene glycol
Show 10 ingredients

CELLULOSE, MICROCRYSTALLINE, CROSPOVIDONE, HYDROXYPROPYL CELLULOSE (1600000 WAMW), HYPROMELLOSES, MAGNESIUM STEARATE, PROPYLENE GLYCOL, SODIUM STARCH GLYCOLATE TYPE A POTATO, STARCH, CORN, TALC, TITANIUM DIOXIDE
Golden State Medical Supply, Inc. 1 product
600 mg extended-release tabletNDC 51407-0741-12 Corn-derived Polyethylene glycol or polysorbate Sorbitol or mannitol
Show 12 ingredients

FERRIC OXIDE RED, GLYCERYL BEHENATE/EICOSADIOATE, HYDROXYPROPYL CELLULOSE (110000 WAMW), HYPROMELLOSE 2208 (100 MPA.S), HYPROMELLOSE 2910 (10000 MPA.S), MAGNESIUM STEARATE, MANNITOL, MICROCRYSTALLINE CELLULOSE, POLYETHYLENE GLYCOL 1000, SILICON DIOXIDE, SODIUM STARCH GLYCOLATE TYPE A POTATO, STARCH, CORN
NorthStar RxLLC 1 product
600 mg extended-release tabletNDC 72603-0246-01 Corn-derived Polyethylene glycol or polysorbate Sorbitol or mannitol
Show 15 ingredients

CROSPOVIDONE, FERRIC OXIDE RED, HYDROXYPROPYL CELLULOSE, UNSPECIFIED, HYPROMELLOSE 2208 (100000 MPA.S), HYPROMELLOSE 2208 (15000 MPA.S), HYPROMELLOSE 2910 (5 MPA.S), MAGNESIUM STEARATE, MANNITOL, MICROCRYSTALLINE CELLULOSE, POLYETHYLENE GLYCOL 400, POLYETHYLENE GLYCOL 6000, SILICON DIOXIDE, SODIUM LAURYL SULFATE, SODIUM STARCH GLYCOLATE TYPE A POTATO, STARCH, CORN
Rising Pharma Holdings, Inc. 1 product
600 mg extended-release tabletNDC 64980-0206-12 Corn-derived Titanium dioxide Polyethylene glycol or polysorbate Sorbitol or mannitol
Show 14 ingredients

CROSPOVIDONE, FERRIC OXIDE YELLOW, HYDROXYPROPYL CELLULOSE (110000 WAMW), HYPROMELLOSE 2208 (15000 MPA.S), HYPROMELLOSE 2208 (200000 MPA.S), MAGNESIUM STEARATE, MANNITOL, MICROCRYSTALLINE CELLULOSE 101, POLYETHYLENE GLYCOL 400, SILICON DIOXIDE, SODIUM LAURYL SULFATE, SODIUM STARCH GLYCOLATE TYPE A POTATO, STARCH, CORN, TITANIUM DIOXIDE
Strides Pharma Science Limited 1 product
600 mg extended-release tabletNDC 64380-0189-01 Corn-derived Polyethylene glycol or polysorbate Sorbitol or mannitol
Show 12 ingredients

FERRIC OXIDE RED, GLYCERYL BEHENATE/EICOSADIOATE, HYDROXYPROPYL CELLULOSE (110000 WAMW), HYPROMELLOSE 2208 (100 MPA.S), HYPROMELLOSE 2910 (10000 MPA.S), MAGNESIUM STEARATE, MANNITOL, MICROCRYSTALLINE CELLULOSE, POLYETHYLENE GLYCOL 1000, SILICON DIOXIDE, SODIUM STARCH GLYCOLATE TYPE A POTATO, STARCH, CORN

A product with none of these listed is not certified to be without them: the label says what the manufacturer declared, and the source of a starch or a flavor is often not stated. The companies are the FDA's labelers, which include repackagers and distributors selling another company's product under their own label. The NDC opens the product's own page, with the full label and its inactive-ingredient notes.

Zileuton and corn-derived ingredients

Corn-derived: corn starch, maize or corn syrup; a concern with corn allergy. Every checked Zileuton product (6) lists corn-derived ingredients.

Lists corn-derived ingredients

Zileuton without titanium dioxide

Titanium dioxide: A white colorant some people choose to avoid. 2 of 6 checked products list titanium dioxide; 4 do not.

Does not list titanium dioxide

Lists titanium dioxide

Zileuton without propylene glycol

Propylene glycol: A solvent in liquids and capsules; a concern in kidney disease, for infants, and at high doses. 1 of 6 checked products list propylene glycol; 5 do not.

Does not list propylene glycol

Lists propylene glycol

Zileuton without polyethylene glycol or polysorbate

Polyethylene glycol or polysorbate: PEG, macrogol or polysorbate; a rare cause of allergic reactions. 5 of 6 checked products list polyethylene glycol or polysorbate; 1 does not.

Does not list polyethylene glycol or polysorbate

Lists polyethylene glycol or polysorbate

Zileuton without sorbitol or mannitol

Sorbitol or mannitol: sugar alcohols that can cause bloating or diarrhea in larger amounts. 5 of 6 checked products list sorbitol or mannitol; 1 does not.

Does not list sorbitol or mannitol

Lists sorbitol or mannitol

At the pharmacy counter

How to use this at the pharmacy counter

  1. Pick the company whose list suits you and copy the NDC from the table. Many pharmacies order from wholesalers that carry several companies' versions and can request a particular one if you ask before the prescription is filled; some buy from one contracted source only, and a few insurance plans cover only certain NDCs, so ask the pharmacist to check.
  2. Treat "does not list" as exactly that. The label is what the manufacturer declared; a flavor or a starch may have an unstated source, and lines change. For celiac disease or a serious allergy, ask the manufacturer's medical information line for a written statement about the lot you have.
  3. Check the bottle each refill. A different company usually means a different shape, color and inactive-ingredient list; the pharmacist can tell you who made it, and the two-NDC comparison shows the difference line by line.
  4. If you need one company's version kept constant, ask your prescriber to write that company or the NDC on the prescription and tell the pharmacy you need it held. Rules vary by state and plan, so confirm with the pharmacist.
Ask Dr. Staiger which Zileuton product suits you →

Common questions about Zileuton inactive ingredients

Is Zileuton gluten-free?
This page cannot certify any Zileuton product gluten-free; it reports what each label declares. Of the 6 products checked, none lists a wheat, barley, rye or gluten ingredient, and none lists a starch without a stated source. If you have celiac disease, ask the manufacturer's medical information line for a written gluten statement for the lot you have.
Does Zileuton contain lactose?
No checked Zileuton product lists lactose on its label. The lactose in a tablet or capsule is a small amount, but people with a milk allergy or a strong intolerance often prefer a version that does not list it.
Does Zileuton contain soy?
No checked Zileuton product lists a soy ingredient (soybean oil or soy lecithin) on its label. Soy lecithin is the usual form and the amount is small, but people with a soy allergy often prefer a version that does not list it.
Is there a dye-free Zileuton?
No checked Zileuton product lists a synthetic dye (an FD&C or D&C colorant) on its label. Colorants often differ by strength within one company's line, so compare the lists above strength by strength.
Does Zileuton contain gelatin?
No checked Zileuton product lists gelatin on its label. Gelatin is usually bovine or porcine and the label rarely says which; for kosher, halal or vegetarian needs, ask the manufacturer.
Why do the inactive ingredients differ between manufacturers?
A generic must match the brand's active ingredient, strength, dose form and how it is absorbed; its fillers, binders, coatings and colorants are the manufacturer's own choice. That is why one Zileuton product can list lactose and a dye while another from a different company lists neither.
Can my pharmacy give me a specific manufacturer's version?
Often, if you ask before the prescription is filled: many pharmacies order from wholesalers that carry several companies' versions and can request a particular one. Some pharmacies buy a generic from one contracted source only, and a few insurance plans cover only certain NDCs, so ask the pharmacist to check. Give them the NDC from this page; the company name alone is often enough.
How current is this list?
The products are the ones in the FDA's current NDC directory as of October 6, 2026, and each inactive-ingredient list is the manufacturer's FDA label as our label sync last read it. Formulations change, so check the label on your own bottle and ask your pharmacist if a refill looks different.

Sources: the products are the finished Zileuton products in the FDA's current NDC directory (openFDA), as of October 6, 2026; each inactive-ingredient list is the manufacturer's FDA Structured Product Label via DailyMed, as our label sync last read it. The concern groups are HelloPharmacist's classification of the names the label declares. Educational information only, not medical advice; confirm with your pharmacist before relying on a list. ← Back to the Zileuton guide