Does diphenhydramine contain wheat or gluten as an excipient?

We cross-check each diphenhydramine product label against four data sources: DailyMed (FDA Structured Product Labels), the European Medicines Agency centrally-authorised medicines database, the Plogsted curated gluten-free drug list, and the 2024 Mangione et al. pediatric pharmacy NDC analysis. Inactive ingredients are scanned against a 146-entry red-flag dictionary covering wheat, barley, rye, malt, source-ambiguous starches, and FDA gluten-free attestation phrases. Mostly yes — but worth a quick call to the manufacturer for some generics. Of 10 product labels we checked, 9 are clean, 0 are confirmed gluten-free by the maker, and 1 contain an inactive ingredient (typically a source-ambiguous starch) whose botanical origin isn't fully disclosed. None contained confirmed gluten.

Can different manufacturers' generic versions of diphenhydramine have different gluten status?

Yes. Generics in the United States must use the same active ingredient as the brand, but they are not required to use the same inactive ingredients. Two generics of diphenhydramine from different manufacturers can use entirely different starch sources, binders, and fillers. A pharmacy may also switch which manufacturer it dispenses between fills without notifying you. Each manufacturer-specific entry below corresponds to a separately-filed product label.

DailyMed checked live · reference data updated August 19, 2026 · 10 product labels screened

Is diphenhydramine gluten-free?

By Ned Walsch

Founder and maintainer of Gluten Screen

Updated August 20, 2026

Not clinically reviewed — verify with your pharmacist

Looks mostly clean — worth verifying with the maker. Mostly yes — but worth a quick call to the manufacturer for some generics. Of 10 product labels we checked, 9 are clean, 0 are confirmed gluten-free by the maker, and 1 contain an inactive ingredient (typically a source-ambiguous starch) whose botanical origin isn't fully disclosed. None contained confirmed gluten.

Drug context

About diphenhydramine

Diphenhydramine is a first-generation antihistamine used for allergies and as a sleep aid, sold under brand names including Benadryl.

Why this matters

Different manufacturers, different ingredients

Generics of diphenhydramine use the same active ingredient, but they aren't required to use the same inactive ingredients. Your pharmacy may switch which manufacturer they dispense between fills, sometimes without telling you. The list below shows each manufacturer's product label as a separate entry, because that's the granularity that actually matters when you're celiac.

The labels

The 10 we checked

01

CVS Pharmacy,Inc. worth a call to confirm

US label (DailyMed) · MULTI SYMPTOM SEVERE COLD AND NIGHTTIME SEVERE COLD AND COUGH (ACETAMINOPHEN, DEXTROMET… · label dated Aug 17, 2026

Worth a call to the maker: CARAMEL

Inactive ingredients ANHYDROUS CITRIC ACID · CARAMEL · FD&C YELLOW NO. 6 · MALTODEXTRIN · POTASSIUM CHLORIDE · POTASSIUM CITRATE · SILICON DIOXIDE · SUCRALOSE · SUCROSE
View source label →
02

BIONPHARMA INC. nothing flagged on the label

US label (DailyMed) · ALLERGY RELIEF (DIPHENHYDRAMINE HCL) TABLET [BIONPHARMA INC.] · label dated Aug 18, 2026

Inactive ingredients ANHYDROUS DIBASIC CALCIUM PHOSPHATE · CARNAUBA WAX · CROSCARMELLOSE SODIUM · D&C RED NO. 27 · HYPROMELLOSE, UNSPECIFIED · MAGNESIUM STEARATE · MICROCRYSTALLINE CELLULOSE · POLYETHYLENE GLYCOL, UNSPECIFIED · POLYSORBATE 80 · TITANIUM DIOXIDE
View source label →
03

CVS PHARMACY nothing flagged on the label

US label (DailyMed) · CVS DYE-FREE CHILDRENS ALLERGY (DIPHENHYDRAMINE HYDROCHLORIDE) SYRUP [CVS PHARMACY] · label dated Aug 18, 2026

Inactive ingredients CARBOXYMETHYLCELLULOSE SODIUM, UNSPECIFIED · POTASSIUM CITRATE · SUCRALOSE · anhydrous citric acid · glycerin · sodium benzoate · sorbitol · water
View source label →
04

CVS PHARMACY nothing flagged on the label

US label (DailyMed) · CVS NIGHTTIME SLEEP AID (DIPHENHYDRAMINE HYDROCHLORIDE AND ACETAMINOPHEN) LIQUID [CVS P… · label dated Aug 17, 2026

Inactive ingredients CITRIC ACID MONOHYDRATE · FD&C BLUE NO. 1 · FD&C RED NO. 40 · GLYCERIN · POTASSIUM CITRATE · PROPYLENE GLYCOL · SODIUM BENZOATE · SORBITOL · SUCRALOSE · WATER
View source label →
05

Shield Pharmaceuticals Corp nothing flagged on the label

US label (DailyMed) · NIGHTTIME SLEEP AID (DIPHENHYDRAMINE HYDROCHLORIDE) CAPSULE, LIQUID FILLED [SHIELD PHAR… · label dated Aug 17, 2026

Inactive ingredients FD&C BLUE NO. 1 · GELATIN · GLYCERIN · ISOPROPYL ALCOHOL · N-BUTYL ALCOHOL · POLYETHYLENE GLYCOL 400 · PROPYLENE GLYCOL · SHELLAC · SORBITOL SOLUTION · TITANIUM DIOXIDE · WATER
View source label →
06

CVS PHARMACY, INC. nothing flagged on the label

US label (DailyMed) · CVS PHARMACY CHILDRENS ALLERGY CHEWS (DIPHENHYDRAMINE HCL) TABLET, CHEWABLE [CVS PHARMA… · label dated Aug 13, 2026

Inactive ingredients CITRIC ACID MONOHYDRATE · CROSPOVIDONE (120 .MU.M) · D&C RED NO. 30 · DEXTROSE, UNSPECIFIED FORM · FD&C BLUE NO. 1 · MAGNESIUM STEARATE · MALTODEXTRIN · POTASSIUM CITRATE · SILICON DIOXIDE · SODIUM POLYSTYRENE SULFONATE · STARCH, CORN · SUCRALOSE
View source label →
07

Shield Pharmaceuticals Corp nothing flagged on the label

US label (DailyMed) · ALLERGY PLUS SINUS HEADACHE (ACETAMINOPHEN 325 MG, DIPHENHYDRAMINE HCL 12.5 MG, PHENYLE… · label dated Aug 13, 2026

Inactive ingredients CROSCARMELLOSE SODIUM · DIBASIC CALCIUM PHOSPHATE DIHYDRATE · MAGNESIUM STEARATE · MICROCRYSTALLINE CELLULOSE · POLYETHYLENE GLYCOL, UNSPECIFIED · POLYVINYL ALCOHOL, UNSPECIFIED · POVIDONE · SILICON DIOXIDE · STARCH, CORN · STEARIC ACID · TALC · TITANIUM DIOXIDE
View source label →
08

WALMART INC. (see also Equate) nothing flagged on the label

US label (DailyMed) · IBUPROFEN PM (DIPHENHYDRAMINE CITRATE, IBUPROFEN) TABLET, COATED [WALMART INC. (SEE ALS… · label dated Aug 13, 2026

Inactive ingredients CARNAUBA WAX · CELLULOSE, MICROCRYSTALLINE · CROSCARMELLOSE SODIUM · FD&C BLUE NO. 2 · HYPROMELLOSE, UNSPECIFIED · POLYDEXTROSE · POLYETHYLENE GLYCOL 400 · SILICON DIOXIDE · STARCH, CORN · STEARIC ACID · TITANIUM DIOXIDE
View source label →
09

CVS PHARMACY, INC. nothing flagged on the label

US label (DailyMed) · CVS PHARMACY DYE FREE CHILDRENS ALLERGY CHEWS (DIPHENHYDRAMINE HCL) TABLET, CHEWABLE [C… · label dated Aug 13, 2026

Inactive ingredients CROSPOVIDONE (120 .MU.M) · DEXTROSE, UNSPECIFIED FORM · MAGNESIUM STEARATE · MALTODEXTRIN · POTASSIUM CITRATE · SILICON DIOXIDE · SODIUM POLYSTYRENE SULFONATE · STARCH, CORN · SUCRALOSE
View source label →
10

Amerisource Bergen nothing flagged on the label

US label (DailyMed) · GOOD NEIGHBOR PHARMACY ALLERGY (DIPHENHYDRAMINE HYDROCHLORIDE) TABLET, FILM COATED [AME… · label dated Aug 12, 2026

Inactive ingredients ANHYDROUS CITRIC ACID · BUTYLATED HYDROXYANISOLE · CROSCARMELLOSE SODIUM · D&C RED NO. 27 ALUMINUM LAKE · HYPROMELLOSE, UNSPECIFIED · MAGNESIUM STEARATE · MICROCRYSTALLINE CELLULOSE · POLYETHYLENE GLYCOL 3350 · POLYVINYL ALCOHOL, UNSPECIFIED · SILICON DIOXIDE · STEARIC ACID · TALC · TITANIUM DIOXIDE · TRIACETIN
View source label →

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Background

What “gluten in a medication” actually means

Gluten enters drugs through their excipients — the inactive ingredients used to bind, coat, fill, or stabilize the dose. The main concern is wheat starch as a filler. Source-ambiguous starches (plain “starch”, pregelatinized starch, sodium starch glycolate, modified starch) get flagged for verification because their botanical origin isn't always disclosed on the label.

The 2024 Mangione et al. pediatric NDC analysis (689 NDCs across the top 100 pediatric medications) found 1.5% contained gluten outright; another 25.7% couldn't be confirmed either way. Liquid and oral-suspension formulations carry disproportionate risk because wheat starch is a common thickener. Full methodology →

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