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Thompson Antacid calcium carbonate 420 mg Tablet, Chewable — NDC 73408-0921-33 package photo
Label image from the product's FDA listing (DailyMed) — may show a different pack size or an older label revision.

Thompson Antacid calcium carbonate 420 mg Tablet, Chewable — NDC 73408-921-33 (Billing 73408-0921-33)

by Thompson · 50 PACKET in 1 BOX / 2 TABLET, CHEWABLE in 1 PACKET

This is a package of Thompson Antacid calcium carbonate 420 mg Tablet, Chewable from Thompson, marketed since May 2022 and currently FDA-listed. It is this product's only package size.

NDC 73408-0921-33
🏷️ FDA NDC (as labeled) 73408-921-33 billing pads the product segment with a zero
OTC On market Non-controlled ⇄ Compare with another NDC
🗂️ FDA directory synced Oct 1, 2026 · this listing last changed Jul 24, 2026 · sources: openFDA · FDA label (DailyMed) · FDA Orange & Purple Book · First Databank · CMS NADAC, ASP, Medicare & Medicaid · RxNorm
📋 All sources & update times →

This page is curated, coded, and maintained by

Compiled from public FDA, CMS, DailyMed, NADAC, and related drug data sources. Editorial policy

⚠️
Other active recalls for Calcium Carbonate (different manufacturers) — 6 · tap to view
These affect other manufacturers’ products for the same ingredient — not necessarily the exact NDC on this page.
Class II · May 28, 2026 — Presence of foreign substance: small metallic particles in chewable tablets. (Guardian Drug Co. Inc.) · FDA recall D-0573-2026
Class II · May 28, 2026 — Presence of foreign substance: small metallic particles in chewable tablets. (Guardian Drug Co. Inc.) · FDA recall D-0561-2026
Class II · May 28, 2026 — Presence of foreign substance: small metallic particles in chewable tablets. (Guardian Drug Co. Inc.) · FDA recall D-0578-2026
Class II · May 28, 2026 — Presence of foreign substance: small metallic particles in chewable tablets. (Guardian Drug Co. Inc.) · FDA recall D-0568-2026
Class II · May 28, 2026 — Presence of foreign substance: small metallic particles in chewable tablets. (Guardian Drug Co. Inc.) · FDA recall D-0579-2026
Class II · May 28, 2026 — Presence of foreign substance: small metallic particles in chewable tablets. (Guardian Drug Co. Inc.) · FDA recall D-0560-2026
Each entry is an official FDA enforcement report — look up any recall number in the FDA recall database ↗

Identity & classification

Regulatory identifiers FDA, NLM and CMS codes for this package

FDA NDC (as labeled) 73408-921-33
Product NDC 73408-921
11-digit billing NDC 73408092133
RxCUI 313884
UNII H0G9379FGK
Application # M001
SPL Set ID d9524a64-6f35-24a8-e053-2995a90a6ca3
Established class (EPC) Blood Coagulation Factor; Cations; Phosphate Binder
Mechanism of action Phosphate Chelating Activity
Physiologic effect Increased Coagulation Factor Activity
Chemical class Calcium; Divalent
DEA schedule Non-controlled
Marketing category OTC MONOGRAPH DRUG
Marketing status On market
FDA listing status Listed (active directory)
Marketing start 2022-05-02
Route ORAL
Dosage form TABLET, CHEWABLE
Substance CALCIUM CARBONATE
Quick answers
  • RxCUI (RxNorm): 313884
Why two NDCs? The FDA registers this code as 73408-921-33 — 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 → 73408-0921-33. 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 Calcium compounds class.

Drug family (ATC) Calcium compounds, Calcium
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.

Clinical

📖 What it is MedlinePlus · NLM

Calcium carbonate is a dietary supplement used when the amount of calcium taken in the diet is not enough. Calcium is needed by the body for healthy bones, muscles, nervous system, and heart. Calcium carbonate also is used as an antacid to relieve heartburn, acid indigestion, and upset stomach. It is available with or without a prescription. This medication is sometimes prescribed for other uses; ask your doctor or pharmacist for more information.

Read the full MedlinePlus article ↗
📗 Our plain-language guide HelloPharmacist
  • Most often it's an antacid. It relieves heartburn, acid indigestion, sour stomach and upset stomach tied to those symptoms. A few supplement products have other uses, like bone sup...
  • What is calcium carbonate usually used for?
  • You chew it when symptoms come on. Many labels say to chew or crush the tablets completely and not swallow them whole. The number of tablets varies by product, so read your label o...
  • Many labels say not to use the maximum dose for more than 2 weeks unless a doctor is supervising you. If your symptoms last longer than 2 weeks, check in with your doctor.
📖 Read our full Calcium Carbonate guide →
4
Nutrient depletion considerations

Calcium Carbonate may be associated with lower levels of 4 nutrients — worth a chat with your pharmacist, not a cause for alarm.

🧪 Full Calcium Carbonate nutrient depletion report →
An association is not a deficiency. Educational only — don't start or stop anything without professional guidance.
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.

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 systemPer eachPer 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.

Packaging — all sizes for this product

Package NDCDescription Marketing startMarketing endStatus
73408-0921-33 You're viewing this Main listing 50 PACKET in 1 BOX / 2 TABLET, CHEWABLE in 1 PACKET 2022-05-02 — Active

Therapeutic equivalents

ProductLabelerPackNADAC/unitTEStatusPrice vs. this
PhysiciansCare Antacid 420 mg 00924-0086-00 Acme 2 tablets — — FDA listed —
First Aid Only Antacid 420 mg 00924-0287-01 Acme 2 tablets — — FDA listed —
Belmora MELOX AGRURA 420 mg 27854-0120-01 Belmora, 2 tablets — — FDA listed —
Medique Alcalak 420 mg 47682-0201-13 Unifirst 2 tablets — — FDA listed —
Medi-First Antacid 420 mg 47682-0820-13 Unifirst 2 tablets — — FDA listed —
Medi-First Plus Antacid 420 mg 47682-0920-33 Unifirst 2 tablets — — FDA listed —
Unishield Antacid 420 mg 49314-1013-03 Unishield 2 tablets — — FDA listed —
Nutralox 420 mg 50090-2440-00 A-S 2 tablets — — FDA listed —
Nutralox 420 mg 50332-0151-01 HART 2 tablets — — FDA listed —
Antacid 420 mg 58228-0091-01 ProStat 20000 tablets — — FDA listed —
McKesson Antacid Calcium Carbonate 420 mg 68599-1411-03 McKesson 2 tablets — — FDA listed —
Calcium Carbonate 420 mg 69168-0036-54 Allegiant 22058 tablets — — FDA listed —
Antacid 420 mg 69396-0142-01 Trifecta 100 tablets — — FDA listed —
Uline Antacid 420 mg 69790-0820-33 Uline 2 tablets — — FDA listed —
Redicare Antacid Mint Flavored 420 mg 71105-0036-02 Redicare 2 tablets — — FDA listed —
Thompson Antacid 420 mgthis 73408-0921-33 Thompson 2 tablets — — FDA listed —
Mint Antacid 100 420 mg 73598-1142-01 JHK 2 tablets — — FDA listed —
Mint Antacid 250 420 mg 73598-1144-01 JHK 2 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

🏛️
2022
On the market since
May 2022
📍
2026
Currently FDA-listed
4 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.

What it looks like

Color white
ShapeRound
ImprintFR;8
Size12 mm
ScoringNot scored
FlavorMint
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 Z0H242BBR1
    Aspartame is an artificial sweetener made from amino acids. It's added to medicines to improve taste, making bitter or unpleasant-tasting drugs easier to take.
  • 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 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 7CVR7L4A2D
    A starch-derived carbohydrate produced by breaking down corn, potato, or tapioca starch. It functions as a filler and binder to give the medicine bulk and texture, and sometimes as a mild sweetener or texture enhancer in powders and tablets.
  • UNII T5L8T28FGP
    Mineral oil is a clear, odorless liquid derived from crude oil. It acts as a lubricant and emollient in medications, helping pills slide smoothly during manufacturing and aiding moisture retention in topical products.
  • UNII 506T60A25R
    Sorbitol is a natural sugar alcohol derived from glucose. It serves as a sweetener, humectant, and bulking agent in medications to improve taste and help maintain moisture in the product.

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

The official label also statesInactive ingredients aspartame, croscarmellose sodium, magnesium stearate, maltodextrin, mineral oil, mint flavor, sorbitol

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.

Manufacturer & labeler

LabelerThompson
FDA applicationM001 (OTC MONOGRAPH DRUG)
Labeler code73408
First marketedMay 2022
Product typeHuman Otc Drug
Portfolio16 products on file
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.

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 🧪 Active Ingredient 🧪 Inactive Ingredients 🎯 Purpose 📄 Do Not Use 📄 Ask a Doctor or Pharmacist Before Use If 📄 When Using This Product 🤰 If Pregnant or Breast-Feeding 📄 Keep Out of Reach of Children 📄 Other Information 📄 Questions or Comments 📄 Package Label / Principal Display Panel
🎯 Indications and Usage 13 words ▾

Uses relieves acid indigestion sour stomach heartburn upset stomach associated with these symptoms

⏱️ Dosage and Administration 38 words ▾

Directions Adults and children: (12 years and older) Chew 2 tablets every 2 - 3 hours as symptoms occur, repeat hourly if needed. Do not exceed 19 tablets in 24 hours. Children under 12 years: Ask a doctor

⚠️ Warnings 1 words ▾

Warnings

🧪 Active Ingredient 9 words ▾

Active ingredient (in each tablet) Calcium Carbonate 420 mg

🧪 Inactive Ingredients 13 words ▾

Inactive ingredients aspartame, croscarmellose sodium, magnesium stearate, maltodextrin, mineral oil, mint flavor, sorbitol

🎯 Purpose 2 words ▾

Purpose Antacid

📄 Do Not Use 23 words ▾

Do not use the maximum dosage of this product for more than 2 weeks except under the advice and supervision of a doctor

📄 Ask a Doctor or Pharmacist Before Use If 25 words ▾

Ask a doctor or pharmacists before use if you are are taking a prescription drug. Antacids may interact with certain prescription drugs. have kidney disease

📄 When Using This Product 32 words ▾

When using this product do not take more than 19 tablets in a 24 hour period. If symptoms persist for more than 2 weeks, stop using this product and see a doctor.

🤰 If Pregnant or Breast-Feeding 11 words ▾

If pregnant or breast feeding, ask a health professional before use.

📄 Keep Out of Reach of Children 7 words ▾

Keep out of the reach of children.

📄 Other Information 37 words ▾

Other information calcium content per tablet: 168 mg phenylketonurics: each tablet may contain 1.5 mg phenylalanine store at room temperature 59-86°F (15-30°C) in a dry place tamper-evident sealed packets do not use any opened or torn packets

📄 Questions or Comments 4 words ▾

Questions or comments? 877.506.4291

📄 Package Label / Principal Display Panel 49 words ▾

Antacid Thompson Safety Works | Business Thrives™ Heartburn, Indigestion Pull to Open Calcium Carbonate 420 mg 100 Tablets Tamper Evident Sealed Packets 101R CS

Antacid Thompson Safety Works | Business Thrives™ Heartburn, Indigestion Pull to Open Calcium Carbonate 420 mg 100 Tablets Tamper Evident Sealed Packets Thompson 2 Antacid

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

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 Thompson Antacid (this brand).

Top reported reactions

Fatigue4,864
Nausea4,274
Pain4,066
Dyspnoea3,875
Diarrhoea3,718
Vomiting3,648
Pneumonia3,264

Age at onset

Neonate80
Infant20
Child108
Adolescent139
Adult3,532
Elderly3,644

Reporter sex

46,687 reports
Male · 32%
Female · 68%
Unknown · 0%

Serious outcomes

Hospitalization22,381
Death7,133
Disabling4,062
Reports over time (by year) — tap or hover for the count & year
2021 2022 2024 2026 3,945 0
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.

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 ✓ Available
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 form printed on the packaging and shown on DailyMed is the one the FDA registered. Insurance claims use a fixed 11-digit 5-4-2 format, so the short segment is padded with a leading zero and the dashes are dropped. The Identity section at the top of this page lists each form of this code.
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 Thompson. Listing status can change — the directory data on this page refreshes weekly.
Who lists this product with the FDA?
Thompson 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.
← 73408-0904-33 · Crane 73408-0923-80 · Thompson →
For educational and professional reference only — not medical advice. Pricing reflects published NADAC and CMS ASP (free public data) and may differ from your acquisition cost; always verify before billing or dispensing.