NDC 51316-0221-08 — Diphenhydramine HCl 50 mg Tablet, Coated

🆔 Identity & classification

FDA NDC (as labeled) 51316-221-08

Product NDC 51316-221

11-digit billing NDC 51316022108

RxCUI 1085945

UNII TC2D6JAD40

UPC 0050428459706

Application # M012

SPL Set ID 1059b55b-c218-843f-e063-6294a90af2fe

Established class (EPC) Histamine-1 Receptor Antagonist

Mechanism of action Histamine H1 Receptor Antagonists

DEA schedule Non-controlled

Marketing category OTC MONOGRAPH DRUG

Marketing status On market

FDA listing status Listed (active directory)

Marketing start 2024-01-31

Route ORAL

Dosage form TABLET, COATED

Substance DIPHENHYDRAMINE HYDROCHLORIDE

Why two NDCs? The FDA registers this code as 51316-221-08 — a 5-3-2 layout, and that's what's printed on the package and shown on DailyMed. For insurance claims, every NDC is standardized to a uniform 11-digit 5-4-2 format by adding a zero to the product segment → 51316-0221-08. Same drug, same package — only the format differs.

Where does this data come from?

Identifiers from the FDA openFDA NDC Directory and Structured Product Labeling; RxCUI from RxNorm (NLM); GPI from Medi-Span; GCN / HIC / AHFS / legend from First Databank.

🏷️ RxNorm drug class

This medicine belongs to the Histamine-1 Receptor Antagonist class.

Pharmacologic class Histamine-1 Receptor Antagonist

Drug family (ATC) Propionic acid derivatives, Antihistamines for topical use, Aminoalkyl ethers

How it works Histamine H1 Receptor Antagonists

Where does this data come from?

Therapeutic classes from RxNorm RxClass (U.S. National Library of Medicine) — Established Pharmacologic Class (FDA), ATC drug family (WHO) and mechanism of action, matched by this product’s RxCUI.

🏭 Manufacturer & labeler

LabelerCVS Pharmacy, Inc.

FDA applicationM012 (OTC MONOGRAPH DRUG)

Labeler code51316

First marketedJan 2024

Product typeHuman Otc Drug

Portfolio128 products on file

🔎 All NDCs from CVS Pharmacy, Inc.

The labeler markets the product; the application holder owns the FDA approval. They’re often the same company but can differ (e.g. a repackager or an authorized generic). A mailing address / phone appears here when the manufacturer includes it in the product’s FDA label (not all do).

Where does this data come from?

Labeler, application holder and registered establishment from the FDA openFDA NDC Directory and Drugs@FDA; address/contact from the product’s FDA label.

🩺 Clinical

📖 What it is MedlinePlus · NLM

Diphenhydramine is used to treat allergy and cold symptoms: sneezing runny nose red, itchy, watery eyes itching of the nose or throat Diphenhydramine is also used to treat insomnia (difficulty falling asleep or staying asleep) in adults, but should not be used to make a child sleepy. Diphenhydramine is in a class of medications called antihistamines. It works by blocking the action of histamine, a substance in the body that causes allergic symptoms. Diphenhydramine is also available in combination with other medications. This monograph only includes information about the use of diphenh...

Read the full MedlinePlus article ↗

📗 Our plain-language guide HelloPharmacist

Diphenhydramine is mainly used to temporarily ease the stuffy, sneezy, itchy symptoms of allergies — like hay fever — and the common cold. Think runny nose, sneezing, watery or itc...
What exactly does diphenhydramine treat?
Yes, and that's one of the most important things to know about this medicine. Drowsiness is one of its most common effects — it crosses into the brain and that's what causes the se...
It depends on your child's age and the product. Most oral diphenhydramine products are not recommended for children under 6, and liquid products labeled for children are generally...

📖 Read our full Diphenhydramine guide →

Patient education

📘 MedlinePlus patient leaflet ↗

Supplement & herbal interactions

🌿 Drug–supplement interaction checker →

Where does this data come from?

Plain-language summary from MedlinePlus (U.S. National Library of Medicine); supplement & herbal interactions and nutrient depletion data from the Natural Medicines database; our full guide is HelloPharmacist editorial content.

💊 What it looks like

Color white

ShapeOval

ImprintC110

Size15 mm

ScoringNot scored

One label can cover several strengths, so colors may be combined — always confirm a loose pill against the dispensed prescription label or a pharmacist.

Where does this data come from?

Physical description (imprint, shape, color, scoring, coating) from this product’s FDA Structured Product Labeling (SPL), mirrored from DailyMed / openFDA.

🧪 Inactive Ingredients / Excipients

Inactive ingredients, also called excipients, are components of the drug product other than the active ingredient. They may include fillers, dyes, coatings, preservatives, flavors, or other formulation ingredients.

💡 Tap an ingredient (hover on desktop) to see what it is and why it’s used.

UNII M28OL1HH48
Croscarmellose sodium is a plant-based substance derived from cellulose. It acts as a disintegrant, helping tablets and capsules break down quickly in the digestive system so the medicine can be absorbed.
UNII O7TSZ97GEP
A mineral compound that serves as a filler and binding agent in tablets and capsules. It adds bulk to the medicine and helps hold ingredients together during manufacturing.
UNII 3NXW29V3WO
Hypromellose is a plant-based thickener made from cellulose. It's used in medicines as a binder to hold ingredients together, a coating for tablets, and a thickener for liquids.
UNII EWQ57Q8I5X
Lactose monohydrate is a natural sugar derived from milk. It serves as a filler and binder in tablets and capsules, helping create the proper size, texture, and consistency of the medicine.
UNII N6K5787QVP
Light mineral oil is a clear, odorless liquid derived from petroleum. In medicines, it acts as a lubricant and emollient to help the product spread smoothly and improve texture.
UNII 70097M6I30
Magnesium stearate is a salt made from magnesium and stearic acid, a fatty substance. It's used in tablets and capsules as a lubricant and glidant to help ingredients flow smoothly during manufacturing and prevent sticking.
UNII OP1R32D61U
Microcrystalline cellulose is a purified form of cellulose, a natural fiber from plant sources. It acts as a binder and filler in tablets and capsules, helping hold ingredients together and give the medicine its shape and size.
UNII ETJ7Z6XBU4
Silicon dioxide is a naturally occurring mineral used as a glidant and anti-caking agent. It helps powder ingredients flow smoothly and prevents clumping during manufacturing and storage.
UNII 4ELV7Z65AP
Stearic acid is a fatty acid derived from plant or animal sources. It acts as a binder and lubricant in tablets and capsules, helping them hold together and flow smoothly during manufacturing.
UNII 7SEV7J4R1U
A powder made from a naturally occurring mineral. In medicines, talc works as a glidant and anti-caking agent, helping tablets and capsules flow smoothly during manufacturing and preventing clumping.
UNII 15FIX9V2JP
Titanium dioxide is a bright white mineral powder commonly used as a colorant and opacifying agent. It makes pills and tablets white or lighter in color and helps make coatings non-transparent.
UNII XHX3C3X673
Triacetin is a clear, oily liquid made from glycerin and acetic acid. It works as a plasticizer and solvent in medicines, helping soften coatings and improve how liquids mix together in formulations.

12 inactive ingredients listed in the exact product block matched to this NDC.

The official label also statescroscarmellose sodium, dibasic calcium phosphate dihydrate, hypromellose, lactose monohydrate, magnesium stearate, microcrystalline cellulose, mineral oil, silicon dioxide, stearic acid, talc, titanium dioxide, triacetin.

Label-section wording can be broader than the structured product block and may mention additional formulation ingredients.

Where does this data come from?

Data sourced from official FDA Structured Product Labeling (SPL) via DailyMed — ingredient classCode="IACT" elements from the exact product block matched by this NDC. Label-section narrative from DailyMed / the openFDA label index is shown separately when available.

Inactive ingredient FAQ

Are inactive ingredients the same for every manufacturer?

No. Inactive ingredients can differ by manufacturer, dosage form, strength, and package / product version.

Why might an inactive ingredient be missing?

Some SPLs do not provide a complete structured inactive-ingredient list, and older or unusual labels may only include the information in narrative text.

Can inactive ingredients matter?

Yes. They can matter for allergies, intolerances, dyes, gluten / lactose concerns, preservatives, and formulation differences — but confirm with a pharmacist or the manufacturer when it’s clinically important.

💲 Pricing

A drug doesn't have one price. Each row is a different public payment system, and none is what you'd pay at the counter — that depends on your insurance. The ⓘ on each row explains what it measures.

Price system	Per each	Per package
Retail pharmacies payNADAC · weekly	Not in the retail survey — common for institutional, discontinued, or low-volume packs.
Medicaid paysCMS SDUD · 12 mo	No recent Medicaid claims on file for this NDC — rare and low-volume NDCs are suppressed in the public data.
Medicare drug plans payPart D · quarterly	No Part D plan price is available for this NDC in our data.

ℹ️

No price is published for this exact package yet. CMS surveys NADAC per package size, so a different pack of the same drug often has one.

Where does this data come from?

NADAC (National Average Drug Acquisition Cost) is the CMS weekly pharmacy-acquisition-cost survey — what pharmacies pay. ASP (Average Sales Price) is the CMS Medicare Part B drug-payment file, published quarterly. Medicaid pays is computed by us from CMS State Drug Utilization Data (total reimbursed ÷ units, trailing 12 months) — gross of rebates and inclusive of dispensing fees, so it reflects what Medicaid paid, not an acquisition cost. Medicare drug plans pay is the median negotiated point-of-sale unit cost across plans listing this NDC in the CMS quarterly Prescription Drug Plan pricing files, before rebates. The VA pays is the federal contract price (FSS, and the statutory Big 4 ceiling where listed) from the VA National Acquisition Center pharmaceutical price file. All are free public government data; each measures a different payer, so the figures are not directly comparable.

🔁 Therapeutic equivalents

Product	Labeler	Pack	NADAC/unit	TE	Status	Price vs. this
Allergy Relief 50 mg 00363-1799-08	Walgreen	12 tablets	—	—	FDA listed	—
Jet-Asleep Double Strength Night Time Sleep Aid 50 mg 15579-0828-17	Bell	100 tablets	—	—	FDA listed	—
Diphenhydramine Hydrochloride 50 mg 17714-0023-50	Advance	50 tablets	—	—	FDA listed	—
Diphenhydramine HCl Maximum Strength 50 mg 37835-0852-50	Bi-Mart	50 tablets	—	—	FDA listed	—
Allergy Relief 50 mg 46122-0829-51	AMERISOURCE	24 tablets	—	—	FDA listed	—
Benadryl Allergy EXTRA STRENGTH 50 mg 50580-0533-24	Kenvue	12 tablets	—	—	FDA listed	—
Diphenhydramine HCl 50 mgthis 51316-0221-08	CVS	12 tablets	—	—	FDA listed	—
Allergy Relief Extra Strength 50 mg 51316-0799-08	CVS	12 tablets	—	—	FDA listed	—
Allergy Relief 50 mg 55910-0450-12	DOLGENCORP	24 tablets	—	—	FDA listed	—
Sominex Max 50 mg 63029-0505-16	Medtech	16 tablets	—	—	FDA listed	—
Allergy Relief 50 mg 69452-0445-24	BIONPHARMA	150 tablets	—	—	FDA listed	—
Somnapure Clinical Strength 50 mg 69721-0005-30	Force	30 tablets	—	—	FDA listed	—

About this product: other versions of the same ingredient, strength and form are listed above, least expensive first, with FDA equivalence ratings where available.

Where does this data come from?

Equivalents are other NDCs of the same ingredient, form and route from the openFDA NDC Directory, ranked least-expensive-first by NADAC. Therapeutic-equivalence (AB) ratings come from the FDA Orange Book; biologics use the FDA Purple Book for biosimilar & interchangeable status.

⏳ Availability & generic status

🏛️

2024

On the market since

Jan 2024

📍

2026

Currently FDA-listed

2 years listed

🔒

·

No generic listed yet

brand only

ℹ️No FDA-approved generic found

We did not find an FDA-approved generic match for this exact strength, form and route.

Where does this data come from?

Patents and exclusivity from the FDA Orange Book (small-molecule drugs), refreshed from public FDA data. Generic launch timing is an estimate, not a guarantee.

📊 Medicare Part D spend CMS · PART D · 2026 (Q1)

Medicare Part D (outpatient prescription) spending for Diphenhydramine HCl — the program that covers self-administered drugs. 8 manufacturers.

⚠️ Drug-level data: CMS publishes Part D spending by drug, not by NDC — these figures combine every manufacturer, strength and package size sold under the name Diphenhydramine HCl. That’s a different level of aggregation than the Medicaid card above, which is specific to this exact 11-digit NDC (pack size included), so the two aren’t directly comparable.

Period

Total Part D spend

$374.3K

Claims incl. refills

20.3K

Beneficiaries

11.2K

Spend / beneficiary

$33.36

Spend / claim

$18.44

Trend by period

💵 About the dollar figures: spending is what Part D plans paid before confidential manufacturer rebates, so the program’s real net cost is lower. A blank patient count means fewer than 11 people — CMS hides counts that small to protect privacy. Source: CMS Medicare Quarterly Part D Spending by Drug (data.cms.gov), updated quarterly.

🔬 Reported adverse events (FAERS)

Read carefully: FAERS reports are voluntary and unverified. Counts are not incidence, do not establish causation, are subject to reporting bias, and cannot be used to compare one drug to another. Shown for signal context only. Reports for Diphenhydramine HCl — the ingredient across all brands.

Top reported reactions

Fatigue1,233

Nausea1,116

Pain989

Headache968

Dyspnoea918

Diarrhoea863

Completed Suicide800

Age at onset

Neonate7

Infant4

Child26

Adolescent25

Adult653

Elderly520

Reporter sex

Male · 37%

Female · 63%

Unknown · 1%

Serious outcomes

Hospitalization5,416

Death3,648

Life-threatening970

Disabling602

Reports over time (by year) — tap or hover for the count & year

Most recent year is provisional (FAERS lags ~3 months).

Where does this data come from?

Adverse-event reports from the FDA Adverse Event Reporting System (FAERS) via openFDA. FAERS reports are voluntary and unverified — counts are not incidence and don’t establish causation.

📦 Packaging — all sizes for this product

Package NDC	Description	Marketing start	Status
51316-0221-08 You're viewing this	2 BLISTER PACK in 1 CARTON (51316-221-08) / 12 TABLET, COATED in 1 BLISTER PACK	2024-01-31	Active

🧭 About this NDC listing & data coverage

Over-the-counter (OTC) product

What data is (and isn’t) available for this NDC — tap to expand

NDC identity (package / product / labeler codes)	✓ Available
Labeler	✓ Available
Product & package description	✓ Available
Marketing category & status	✓ Available
Active ingredient / dosage form / route	✓ Available
FDA label (SPL via DailyMed)	✓ Available
Package photos	— Not published for this NDC No photo available yet for this listing.
Inactive ingredients (structured)	✓ Available
NADAC pharmacy acquisition price (CMS)	— Not published for this NDC CMS publishes NADAC only for NDCs reported in its retail-pharmacy survey.
Orange Book / therapeutic-equivalence data	— Not published for this NDC Applies only to products approved under an NDA/ANDA; many listings are out of scope.
HCPCS J-code billing crosswalk	— Not published for this NDC Most self-administered / retail products have no J-code — that is normal.
Medicaid utilization (CMS SDUD)	— Not published for this NDC CMS reports utilization only for NDCs with Medicaid claims above its privacy threshold.

“Not published” reflects what the public FDA / CMS / NLM sources provide for this exact package code — it is a property of the data feeds, not a judgment about the product.

Questions about this listing

Is this NDC FDA-approved?

An NDC listing does not by itself establish FDA approval — the NDC Directory records that a product is listed with FDA, not that it was reviewed and approved. This listing's marketing category is "Otc Monograph Drug". Products approved under an application carry an NDA, ANDA, or BLA number.

Why is there no price listed?

The pricing shown on our NDC pages comes from CMS NADAC, a voluntary survey of retail community pharmacy invoices. CMS does not publish a NADAC for every NDC — packages outside the retail survey (institutional and hospital products, bulk packages, discontinued items, and many OTC items) may never receive one. A missing price reflects the survey's scope, not this product's actual cost, and does not mean the product is free or unavailable.

Is the NDC printed on the package the same as the 11-digit billing NDC?

Yes, they identify this exact package in different formats. The FDA registers it as 51316-221-08, which is what is printed on the packaging and shown on DailyMed. Insurance claims use a fixed 11-digit 5-4-2 format, so the short segment is padded with a leading zero: 51316-0221-08, written without dashes as 51316022108. The Identity section at the top of this page lists every form of this code.

What do the three segments of this NDC mean?

In 51316-0221-08, the first segment (51316) is the labeler code FDA assigned to CVS Pharmacy, Inc.; the middle segment (0221) identifies this specific product — its ingredient, strength, and dosage form; and the last segment (08) identifies this exact package size and type. Together they name one specific package of one specific product.

Is this package still being marketed?

Yes, per the latest FDA NDC Directory data on this page: this package is listed as actively marketed, with no marketing end date reported by CVS Pharmacy, Inc.. Listing status can change — the directory data on this page refreshes weekly.

Who lists this product with the FDA?

CVS Pharmacy, Inc. is the labeler of record for this NDC — the company under whose FDA-assigned code the package is listed. The labeler may be the manufacturer itself or a distributor marketing the product under its own code.

Do I need a prescription for this product?

This NDC is listed with FDA as an over-the-counter product, so it does not require a prescription. Follow the package directions, and ask your pharmacist if you are unsure whether it is right for you.

This page identifies an FDA-listed package (the NDC) and reports public regulatory and pricing data about the listing. It is reference information, not a medical recommendation — talk to your pharmacist or prescriber about your own medication.

Where does this data come from?

Listing facts (marketing category, packager status, marketing dates) from the FDA openFDA NDC Directory; label availability from DailyMed; pricing coverage from CMS NADAC; equivalence scope from the FDA Orange Book.

📄 FDA label — Drug Facts FDA SPL

The complete FDA label for this product — the official Drug Facts labeling, verbatim, section by section. Jump with a chip, search within the label, or expand everything.

🎯 Indications and Usage ⏱️ Dosage and Administration ⚠️ Warnings 🆘 Overdosage 🧪 Active Ingredient 🧪 Inactive Ingredients 🎯 Purpose

🎯 Indications and Usage 37 words ▾

Uses temporarily relives symptoms due to hay fever or other upper respiratory allergies: runny nose sneezing itchy, watery eyes itching of the nose or throat temporarily relives these symptoms due to the common cold: runny nose sneezing

⏱️ Dosage and Administration 43 words ▾

Directions take every 4 to 6 hours, or as directed by a doctor do not take more than 6 doses in 24 hours adults and children 12 years of age and over 1 caplet children under 12 years of age do not use

⚠️ Warnings 125 words ▾

Do not use to make a child sleepy with any other product containing diphenhydramine, even one used on skin Ask a doctor before use if you have a breathing problem such as emphysema or chronic bronchitis glaucoma trouble urinating due to an enlarged prostate gland Ask a doctor or pharmacist before use if you are taking sedatives or tranquilizers When using this product marked drowsiness mau occur avoid alcoholic drinks alcohol, sedatives and tranquilizers may increase drowsiness be careful when driving a motor vehicle or operating machinery excitability may occur, especially in children If pregnant or brest-feeding, ask a health professional before use.

Keep out of reach of children. In case of overdose, get medical help or contact a Poison Control Center (1-800-222-1222) right away.

🆘 Overdosage 16 words ▾

In case of overdose, get medical help or contact a Poison Control Center (1-800-222-1222) right away.

🧪 Active Ingredient 11 words ▾

Drug Facts Active ingredient (in each caplet) Diphenhydramine HCl 50 mg

🧪 Inactive Ingredients 23 words ▾

croscarmellose sodium, dibasic calcium phosphate dihydrate, hypromellose, lactose monohydrate, magnesium stearate, microcrystalline cellulose, mineral oil, silicon dioxide, stearic acid, talc, titanium dioxide, triacetin.

🎯 Purpose 2 words ▾

Purpose Antihistamine

Source: FDA Structured Product Labeling, mirrored from DailyMed / openFDA. Prefer the government’s original formatting? View this label on DailyMed ↗

🔗 Related NDC lookups

🧪 All Diphenhydramine Hcl NDCsSame ingredient 🏭 All CVS labeler NDCsLabeler code 51316 📚 All Histamine-1 Receptor Antagonist NDCsDrug class