Inactive ingredients by manufacturer

Chlorzoxazone inactive ingredients by manufacturer

Wondering whether your Chlorzoxazone 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 Chlorzoxazone 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 32 of the 33 current Chlorzoxazone products on the market today, from 18 companies listing it with the FDA, and lined them up side by side. 1 label has no inactive-ingredient list we could read, so that product cannot be compared.

Ask about your bottle

Is there something in your Chlorzoxazone? 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 Chlorzoxazone products list lactose, a gluten source, soy, dyes or gelatin?

  1. LactoseDiffers by manufacturer

    30 of 32 checked products list lactose; 2 do not. See the products

    Does not list it Bryant Ranch Prepack Novitium
    Lists it A-S Medication Solutions Actavis Advanced Rx of Tennessee Aurobindo Bryant Ranch Prepack Camber Cintex Services Endo Happy Robin Lifsa Drugs Mayne Pharma Commercial PD-Rx Proficient Rx Remedyrepack Rising Solubiomix
  2. Wheat or gluten sourceNo checked product

    No checked Chlorzoxazone product lists a wheat or gluten source.

  3. SoyNo checked product

    No checked Chlorzoxazone product lists soy.

  4. Synthetic dyesDiffers by manufacturer

    4 of 32 checked products list synthetic dyes; 28 do not. See the products

    Does not list it A-S Medication Solutions Actavis Advanced Rx of Tennessee Aurobindo Bryant Ranch Prepack Camber Cintex Services Endo Happy Robin Lifsa Drugs Mayne Pharma Commercial Novitium PD-Rx Proficient Rx Rising Solubiomix
    Lists it Aurobindo Bryant Ranch Prepack Proficient Rx Remedyrepack
  5. GelatinNo checked product

    No checked Chlorzoxazone product lists gelatin.

Also listed by some products: Corn 28 of 32 Alcohol 1 of 32 PEG or polysorbate 4 of 32

Find a version without it

Every current Chlorzoxazone product and what its label lists

Hide products that list:

ProductListsInactive ingredients on the label
A-S Medication Solutions 2 products
500 mg tabletNDC 50090-7504-00 Lactose Corn-derived
Show 7 ingredients

ANHYDROUS LACTOSE, CELLULOSE, MICROCRYSTALLINE, CROSCARMELLOSE SODIUM, DIETHYLHEXYL SODIUM SULFOSUCCINATE, MAGNESIUM STEARATE, SODIUM BENZOATE, ZEA MAYS (CORN) STARCH
500 mg tabletNDC 50090-0315-00 Lactose Corn-derived
Show 7 ingredients

DOCUSATE SODIUM, LACTOSE MONOHYDRATE, MAGNESIUM STEARATE, MICROCRYSTALLINE CELLULOSE, SODIUM BENZOATE, SODIUM STARCH GLYCOLATE TYPE A POTATO, STARCH, CORN
Actavis Pharma, Inc. 1 product
500 mg tabletNDC 00591-2520-00 Lactose Corn-derived
Show 7 ingredients

CELLULOSE, MICROCRYSTALLINE, DOCUSATE SODIUM, LACTOSE MONOHYDRATE, MAGNESIUM STEARATE, SODIUM BENZOATE, SODIUM STARCH GLYCOLATE TYPE A POTATO, STARCH, CORN
Advanced Rx of Tennessee, LLC 3 products
375 mg tabletNDC 80425-0525-01 Lactose Corn-derived
Show 7 ingredients

CROSCARMELLOSE SODIUM, DOCUSATE SODIUM/SODIUM BENZOATE, LACTOSE MONOHYDRATE, MAGNESIUM STEARATE, MICROCRYSTALLINE CELLULOSE, SILICON DIOXIDE, STARCH, CORN
500 mg tabletNDC 80425-0507-01 Lactose Corn-derived
Show 7 ingredients

ANHYDROUS LACTOSE, CROSCARMELLOSE SODIUM, DOCUSATE SODIUM, MAGNESIUM STEARATE, MICROCRYSTALLINE CELLULOSE, SODIUM BENZOATE, STARCH, CORN
750 mg tabletNDC 80425-0526-01 Lactose Corn-derived
Show 7 ingredients

CROSCARMELLOSE SODIUM, DOCUSATE SODIUM/SODIUM BENZOATE, LACTOSE MONOHYDRATE, MAGNESIUM STEARATE, MICROCRYSTALLINE CELLULOSE, SILICON DIOXIDE, STARCH, CORN
Advanced Rx Pharmacy of Tennessee, LLC 1 product
500 mg tabletNDC 80425-0315-01 No inactive-ingredient list on the label No list we could read
Aurobindo Pharma Limited 3 products
375 mg tabletNDC 59651-0305-01 Lactose Corn-derived
Show 7 ingredients

CROSCARMELLOSE SODIUM, DOCUSATE SODIUM/SODIUM BENZOATE, LACTOSE MONOHYDRATE, MAGNESIUM STEARATE, MICROCRYSTALLINE CELLULOSE, SILICON DIOXIDE, STARCH, CORN
500 mg tabletNDC 59651-0306-01 Lactose Corn-derived Synthetic dyes Polyethylene glycol or polysorbate
Show 9 ingredients

D&C RED NO. 27, FD&C YELLOW NO. 6, HYPROMELLOSE 2910 (3 MPA.S), LACTOSE MONOHYDRATE, MAGNESIUM STEARATE, MICROCRYSTALLINE CELLULOSE, POLYSORBATE 80, SODIUM STARCH GLYCOLATE TYPE A POTATO, STARCH, CORN
750 mg tabletNDC 59651-0307-01 Lactose Corn-derived
Show 7 ingredients

CROSCARMELLOSE SODIUM, DOCUSATE SODIUM/SODIUM BENZOATE, LACTOSE MONOHYDRATE, MAGNESIUM STEARATE, MICROCRYSTALLINE CELLULOSE, SILICON DIOXIDE, STARCH, CORN
Bryant Ranch Prepack 5 products
500 mg tabletNDC 71335-1914-01 Corn-derived
Show 7 ingredients

CROSCARMELLOSE SODIUM, DOCUSATE SODIUM, MAGNESIUM STEARATE, MICROCRYSTALLINE CELLULOSE, SILICON DIOXIDE, SODIUM BENZOATE, STARCH, CORN
500 mg tabletNDC 63629-1586-01 Lactose Corn-derived
Show 7 ingredients

DOCUSATE SODIUM, LACTOSE MONOHYDRATE, MAGNESIUM STEARATE, MICROCRYSTALLINE CELLULOSE, SODIUM BENZOATE, SODIUM STARCH GLYCOLATE TYPE A POTATO, STARCH, CORN
500 mg tabletNDC 71335-2009-01 Lactose Corn-derived Synthetic dyes Polyethylene glycol or polysorbate
Show 9 ingredients

D&C RED NO. 27, FD&C YELLOW NO. 6, HYPROMELLOSE 2910 (3 MPA.S), LACTOSE MONOHYDRATE, MAGNESIUM STEARATE, MICROCRYSTALLINE CELLULOSE, POLYSORBATE 80, SODIUM STARCH GLYCOLATE TYPE A POTATO, STARCH, CORN
500 mg tabletNDC 71335-2433-01 Lactose Corn-derived
Show 7 ingredients

ANHYDROUS LACTOSE, CROSCARMELLOSE SODIUM, DOCUSATE SODIUM, MAGNESIUM STEARATE, MICROCRYSTALLINE CELLULOSE, SODIUM BENZOATE, STARCH, CORN
500 mg tabletNDC 71335-3122-00 Lactose
Show 7 ingredients

CROSCARMELLOSE SODIUM, DOCUSATE SODIUM, LACTOSE MONOHYDRATE, MAGNESIUM STEARATE, MICROCRYSTALLINE CELLULOSE, SILICON DIOXIDE, SODIUM BENZOATE
Camber Pharmaceuticals, Inc. 1 product
250 mg tabletNDC 31722-0974-01 Lactose Corn-derived
Show 8 ingredients

ANHYDROUS LACTOSE, CROSCARMELLOSE SODIUM, DOCUSATE SODIUM, LACTOSE MONOHYDRATE, MAGNESIUM STEARATE, MICROCRYSTALLINE CELLULOSE, SODIUM BENZOATE, STARCH, CORN
Cintex Services, LLC 2 products
250 mg tabletNDC 24470-0923-10 Lactose
Show 7 ingredients

CELLULOSE, MICROCRYSTALLINE, CROSCARMELLOSE SODIUM, DOCUSATE SODIUM, LACTOSE MONOHYDRATE, MAGNESIUM STEARATE, SILICON DIOXIDE, SODIUM BENZOATE
500 mg tabletNDC 24470-0940-10 Lactose
Show 7 ingredients

CELLULOSE, MICROCRYSTALLINE, CROSCARMELLOSE SODIUM, DOCUSATE SODIUM, LACTOSE MONOHYDRATE, MAGNESIUM STEARATE, SILICON DIOXIDE, SODIUM BENZOATE
Endo USA, Inc. 2 products
375 mg tabletNDC 00254-2053-01 Lactose Corn-derived
Show 6 ingredients

ANHYDROUS LACTOSE, CROSCARMELLOSE SODIUM, DOCUSATE SODIUM/SODIUM BENZOATE, MAGNESIUM STEARATE, MICROCRYSTALLINE CELLULOSE, STARCH, CORN
750 mg tabletNDC 00254-2005-01 Lactose Corn-derived
Show 6 ingredients

ANHYDROUS LACTOSE, CROSCARMELLOSE SODIUM, DOCUSATE SODIUM/SODIUM BENZOATE, MAGNESIUM STEARATE, MICROCRYSTALLINE CELLULOSE, STARCH, CORN
Happy Robin, LLC 1 product
250 mg tabletNDC 87127-0801-60 Lactose
Show 7 ingredients

CELLULOSE, MICROCRYSTALLINE, CROSCARMELLOSE SODIUM, DOCUSATE SODIUM, LACTOSE MONOHYDRATE, MAGNESIUM STEARATE, SILICON DIOXIDE, SODIUM BENZOATE
Lifsa Drugs LLC 1 product
250 mg tabletNDC 72336-0225-60 Lactose Corn-derived
Show 8 ingredients

ANHYDROUS LACTOSE, CROSCARMELLOSE SODIUM, DOCUSATE SODIUM, LACTOSE MONOHYDRATE, MAGNESIUM STEARATE, MICROCRYSTALLINE CELLULOSE, SODIUM BENZOATE, STARCH, CORN
Mayne Pharma Commercial LLC 1 product
500 mg tabletNDC 51862-0339-01 Lactose Corn-derived
Show 7 ingredients

CROSCARMELLOSE SODIUM, DOCUSATE SODIUM, LACTOSE MONOHYDRATE, MAGNESIUM STEARATE, MICROCRYSTALLINE CELLULOSE, SODIUM BENZOATE, STARCH, CORN
Novitium Pharma LLC 1 product
500 mg tabletNDC 70954-0085-10 Corn-derived
Show 7 ingredients

CELLULOSE, MICROCRYSTALLINE, CROSCARMELLOSE SODIUM, DOCUSATE SODIUM, MAGNESIUM STEARATE, SILICON DIOXIDE, SODIUM BENZOATE, STARCH, CORN
PD-Rx Pharmaceuticals, Inc. 1 product
500 mg tabletNDC 55289-0633-10 Lactose Corn-derived
Show 7 ingredients

CELLULOSE, MICROCRYSTALLINE, DOCUSATE SODIUM, LACTOSE MONOHYDRATE, MAGNESIUM STEARATE, SODIUM BENZOATE, SODIUM STARCH GLYCOLATE TYPE A POTATO, STARCH, CORN
Proficient Rx LP 2 products
500 mg tabletNDC 71205-0711-20 Lactose Corn-derived Synthetic dyes Alcohol (ethanol) Polyethylene glycol or polysorbate
Show 10 ingredients

ALCOHOL, D&C RED NO. 27, FD&C YELLOW NO. 6, HYPROMELLOSE 2910 (3 MPA.S), LACTOSE MONOHYDRATE, MAGNESIUM STEARATE, MICROCRYSTALLINE CELLULOSE, POLYSORBATE 80, SODIUM STARCH GLYCOLATE TYPE A POTATO, STARCH, CORN
500 mg tabletNDC 63187-0317-20 Lactose Corn-derived
Show 7 ingredients

DOCUSATE SODIUM, LACTOSE MONOHYDRATE, MAGNESIUM STEARATE, MICROCRYSTALLINE CELLULOSE, SODIUM BENZOATE, SODIUM STARCH GLYCOLATE TYPE A POTATO, STARCH, CORN
Remedyrepack Inc. 1 product
500 mg tabletNDC 70518-4364-00 Lactose Corn-derived Synthetic dyes Polyethylene glycol or polysorbate
Show 9 ingredients

D&C RED NO. 27, FD&C YELLOW NO. 6, HYPROMELLOSE 2910 (3 MPA.S), LACTOSE MONOHYDRATE, MAGNESIUM STEARATE, MICROCRYSTALLINE CELLULOSE, POLYSORBATE 80, SODIUM STARCH GLYCOLATE TYPE A POTATO, STARCH, CORN
Rising Pharma Holdings, Inc. 4 products
250 mg tabletNDC 64980-0582-06 Lactose Corn-derived
Show 6 ingredients

ANHYDROUS LACTOSE, CROSCARMELLOSE SODIUM, DOCUSATE SODIUM/SODIUM BENZOATE, MAGNESIUM STEARATE, MICROCRYSTALLINE CELLULOSE 101, STARCH, CORN
375 mg tabletNDC 16571-0725-01 Lactose Corn-derived
Show 7 ingredients

ANHYDROUS LACTOSE, CROSCARMELLOSE SODIUM, DOCUSATE SODIUM, MAGNESIUM STEARATE, MICROCRYSTALLINE CELLULOSE, SODIUM BENZOATE, STARCH, CORN
500 mg tabletNDC 16571-0726-01 Lactose Corn-derived
Show 7 ingredients

ANHYDROUS LACTOSE, CROSCARMELLOSE SODIUM, DOCUSATE SODIUM, MAGNESIUM STEARATE, MICROCRYSTALLINE CELLULOSE, SODIUM BENZOATE, STARCH, CORN
750 mg tabletNDC 16571-0727-01 Lactose Corn-derived
Show 7 ingredients

ANHYDROUS LACTOSE, CROSCARMELLOSE SODIUM, DOCUSATE SODIUM, MAGNESIUM STEARATE, MICROCRYSTALLINE CELLULOSE, SODIUM BENZOATE, STARCH, CORN
Solubiomix 1 product
250 mg tabletNDC 69499-0330-60 Lactose Corn-derived
Show 7 ingredients

ANHYDROUS LACTOSE, CELLULOSE, MICROCRYSTALLINE, CROSCARMELLOSE SODIUM, DOCUSATE SODIUM, MAGNESIUM STEARATE, SODIUM BENZOATE, 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.

Chlorzoxazone without lactose

Lactose: milk sugar; a concern with lactose intolerance or a milk allergy. 30 of 32 checked products list lactose; 2 do not.

Does not list lactose

Lists lactose

Chlorzoxazone without synthetic dyes

Synthetic dyes: FD&C or D&C colorants and their aluminum lakes. 4 of 32 checked products list synthetic dyes; 28 do not.

Does not list synthetic dyes

Lists synthetic dyes

Chlorzoxazone without corn-derived ingredients

Corn-derived: corn starch, maize or corn syrup; a concern with corn allergy. 28 of 32 checked products list corn-derived ingredients; 4 do not.

Does not list corn-derived ingredients

Lists corn-derived ingredients

Chlorzoxazone without alcohol (ethanol)

Alcohol (ethanol): mostly in liquids; a concern in alcohol recovery, for children, or with disulfiram or metronidazole. 1 of 32 checked products list alcohol (ethanol); 31 do not.

Does not list alcohol (ethanol)

Lists alcohol (ethanol)

Chlorzoxazone without polyethylene glycol or polysorbate

Polyethylene glycol or polysorbate: PEG, macrogol or polysorbate; a rare cause of allergic reactions. 4 of 32 checked products list polyethylene glycol or polysorbate; 28 do not.

Does not list polyethylene glycol or polysorbate

Lists polyethylene glycol or polysorbate

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 Chlorzoxazone product suits you →

Common questions about Chlorzoxazone inactive ingredients

Is Chlorzoxazone gluten-free?
This page cannot certify any Chlorzoxazone product gluten-free; it reports what each label declares. Of the 32 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 Chlorzoxazone contain lactose?
30 of 32 checked Chlorzoxazone products list lactose; 2 do not: Bryant Ranch Prepack (500 mg tablet) and Novitium (500 mg tablet). 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 Chlorzoxazone contain soy?
No checked Chlorzoxazone 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 Chlorzoxazone?
4 of 32 checked Chlorzoxazone products list a synthetic dye (an FD&C or D&C colorant); 28 do not: A-S Medication Solutions (500 mg tablet), Actavis (500 mg tablet), Advanced Rx of Tennessee (375 mg tablet, 500 mg tablet and 750 mg tablet) and Aurobindo (375 mg tablet and 750 mg tablet) and 12 other companies. Colorants often differ by strength within one company's line, so compare the lists above strength by strength.
Does Chlorzoxazone contain gelatin?
No checked Chlorzoxazone 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 Chlorzoxazone 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 Chlorzoxazone 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 Chlorzoxazone guide