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Magnesium Oxide 400 mg Tablet, 1,000-count — NDC 81033-0027-01 package photo
Label image from the product's FDA listing (DailyMed) — may show a different pack size or an older label revision.

Magnesium Oxide 400 mg Tablet, 1,000-count — NDC 81033-027-01 (Billing 81033-0027-01)

by Kesin Pharma · 10 BLISTER PACK in 1 CARTON / 100 TABLET in 1 BLISTER PACK

This is a package of 1,000 tablets of Magnesium Oxide 400 mg Tablet from Kesin Pharma, marketed since Apr 2025 and currently FDA-listed; retail pharmacies pay about $0.0346 per tablet (NADAC). It is the main listing for this product, which comes in 2 package sizes.

NDC 81033-0027-01
🏷️ FDA NDC (as labeled) 81033-027-01 billing pads the product segment with a zero
This package
Contains1,000-count Cost per ea$0.0346 NADAC Per package$34.60 / 1000 tablets Pack sizes2 compare ↓
Main listing for product 81033-027 · Also comes in: 120 tablets 81033-027-12
OTC On market Non-controlled ⇄ Compare with another NDC
🗂️ FDA directory synced Oct 8, 2026 · this listing last changed Oct 8, 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

NDC database record

One package, one record: these facts belong to NDC 81033-027-01 alone.

Record
FDA NDC Directory package listing · Human OTC drug
Code segments
81033 labeler · 027 product · 01 package
Package marketed since
Nov 1, 2025
Sample package
No — commercial package
Listing certified through
Dec 31, 2026
Billing quantity
1,000 EA per package
Barcode (UPC)
0381033027128
FDA record last changed
Oct 8, 2026

Identity & classification

Regulatory identifiers FDA, NLM and CMS codes for this package

FDA NDC (as labeled) 81033-027-01
Product NDC 81033-027
11-digit billing NDC 81033002701
NCPDP billing unit EA — each (per item)
RxCUI 198741
UNII 3A3U0GI71G
UPC 0381033027128
Application # M001
SPL Set ID 31f417f0-1637-eefa-e063-6294a90a121b
Established class (EPC) Calculi Dissolution Agent; Osmotic Activity
Mechanism of action Magnesium Ion Exchange Activity
Physiologic effect Increased Large Intestinal Motility; Inhibition Large Intestine Fluid/Electrolyte Absorption; Inhibition Small Intestine Fluid/Electrolyte Absorption
DEA schedule Non-controlled
Marketing category OTC MONOGRAPH DRUG
Marketing status On market
FDA listing status Listed (active directory)
Marketing start 2025-04-07
Route ORAL
Dosage form TABLET
Substance MAGNESIUM OXIDE

Drug-database identifiers Medi-Span GPI and First Databank GCN / HICL / AHFS classification

GCN Seq No 078687
GCN 45064
HICL code 000609
Ingredient (HICL) Magnesium Oxide
HIC1 code D
Therapeutic class — broad (HIC1) Biliary System/Gastro-Intestinal System
HIC2 code D4
Therapeutic class — intermediate (HIC2) Drugs Acting Principally On The Alimentary Tract
HIC3 code D4B
Therapeutic class — specific (HIC3) Antacids
AHFS code 56:04.00.00
AHFS class Antacids And Adsorbents
FDB label name MAGNESIUM OXIDE 400 MG TABLET
FDB brand name Magnesium Oxide
Legend status O — Over-the-counter (OTC) drug or device
Quick answers
  • GSN (GCN sequence number): 078687
  • GCN: 45064
  • HICL (First Databank): 000609
  • AHFS class code: 56:04.00.00
  • RxCUI (RxNorm): 198741
Why two NDCs? The FDA registers this code as 81033-027-01 — 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 → 81033-0027-01. 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 Magnesium compounds class.

Drug family (ATC) Magnesium compounds, Osmotically acting laxatives, Magnesium
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

Label name MAGNESIUM OXIDE 400 MG TABLET Ingredient Magnesium Oxide
📗 Our plain-language guide HelloPharmacist
  • It's used to relieve acid indigestion and upset stomach. Some products, like Magnesium Oxide 400mg, are also used as a magnesium supplement. Check which use your product is labeled...
  • For antacid use, the labels say 1 tablet twice a day or as directed by your doctor. For supplement use, the directions vary by product, from 1 tablet daily to 1 to 2 tablets daily....
  • The dietary supplement tablet suggests taking it preferably with food. The other labels don't give a food instruction, so follow what's on your package or what your prescriber tell...
  • The main one is a laxative effect, meaning looser or more frequent stools. If that bothers you or you're using more than the label allows, check in with your doctor or pharmacist.
📖 Read our full Magnesium Oxide guide →

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.

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 eaPer package
Retail pharmacies payNADAC · weekly $0.035 $34.60 / 1000 tablets
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.
NADAC price history (per ea) — tap or hover for the price & month
Jul 2026 Aug 2026 Sep 2026 $0.035 $0.035
Flat over the last 3 months.
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 Per unit Per pack Marketing startMarketing endStatus
81033-0027-01 You're viewing this Main listing 10 BLISTER PACK in 1 CARTON / 100 TABLET in 1 BLISTER PACK $0.0346 / ea $34.57 2025-11-01 — Active
81033-0027-12 81033-027-12 120 TABLET in 1 BOTTLE $0.0346 / ea $4.15 2025-04-07 — Active

This pack has the lowest per-ea cost of the 2 priced pack sizes ($0.0346 NADAC).

This pack shows little to no recent Medicaid volume — the 120 tablets pack carries most fills. See all packs ↓

Pack size FAQ

What quantity is in this package?
This is a 1,000-count package — 10 blister pack in 1 carton / 100 tablet in 1 blister pack.
How does this package differ from NDC 81033-0027-12?
Both are Magnesium Oxide 400 mg Tablet — the drug itself is identical. This page's package is the 1,000-count one, while NDC 81033-0027-12 is the 120 tablets package.
What NDC number is used to bill for this package of Magnesium Oxide 400 mg Tablet?
Use the 11-digit billing form listed in the identifiers section of this page. Pharmacy and medical claims use the 11-digit form; the FDA label may print a shorter form of the same code.

Prices are the latest CMS NADAC pharmacy acquisition cost per NDC; per-pack figures are per-unit × pack quantity, shown only when the pack is denominated in the same measure NADAC prices.

Therapeutic equivalents

ProductLabelerPackNADAC/unitTEStatusPrice vs. this
Magnesium Oxide 400 mg 00603-0209-22 Endo 120 tablets $0.035 — Availability likely —
Magnesium Oxide 400 mg 24689-0132-01 APNAR 120 tablets $0.035 — Availability likely —
Magnesium Oxide 400 mg 58657-0120-12 Method 120 tablets $0.035 — Availability likely —
Magnesium Oxide 400 mg 69367-0298-20 Westminster 120 tablets $0.035 — Availability likely —
Magnesium Oxide 400 mgthis 81033-0027-01 Kesin 1000 tablets $0.035 — Availability likely —
Magnesium Oxide 400 mg 10135-0786-62 Marlex 120 tablets — — FDA listed —
Magnesium Oxide 400 mg 50090-7432-00 A-S 120 tablets — — FDA listed —
Magnesium Oxide 400 mg 54738-0973-12 Richmond 120 tablets — — Discontinued —
Magnesium Oxide 400 mg 63629-1126-01 Bryant 120 tablets — — Discontinued —
Magnesium Oxide 400 mg 63629-9420-01 Bryant 120 tablets — — FDA listed —
Magnesium Oxide 400mg 400 mg 69168-0174-06 Allegiant 120 tablets — — FDA listed —
Magnesium Oxide 400 mg 71335-1960-01 Bryant 60 tablets — — FDA listed —
Magnesium Oxide 400 mg 71610-0172-60 Aphena 90 tablets — — FDA listed —
Magnesium Oxide 400 mg 71610-0182-60 Aphena 90 tablets — — FDA listed —
Magnesium Oxide 400 mg 72162-1648-04 Bryant 120 tablets — — FDA listed —
Magnesium Oxide 241.3 mg/1000mg 84447-0001-12 Belleview 120 mg — — 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

🏛️
2025
On the market since
Apr 2025
📍
2026
Currently FDA-listed
1 year 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
ImprintMG
Size11 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.

🧪 Avoiding an ingredient? See Magnesium Oxide inactive ingredients by manufacturer: every current product's list side by side, so you can ask your pharmacy for the version that does not list it.

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

  • 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 5856J3G2A2
    A starch-based powder made from potatoes and processed with sodium. It acts as a disintegrant, helping the tablet or capsule break apart quickly in the stomach so the medicine can be absorbed.
  • 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.

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

The official label also statesmicrocrystalline cellulose, sodium starch glycolate, stearic acid.

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

LabelerKesin Pharma
FDA applicationM001 (OTC MONOGRAPH DRUG)
Labeler code81033
First marketedApr 2025
Product typeHuman Otc Drug
Portfolio6 products on file

More NDCs from Kesin Pharma labeler code 81033

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 Before Use If 📄 Ask a Doctor or Pharmacist Before Use If 🤰 If Pregnant or Breast-Feeding 📄 Keep Out of Reach of Children 📄 Other Information 📄 Questions or Comments 📄 Package Label / Principal Display Panel
🎯 Indications and Usage 6 words ▾

Uses relieves acid indigestion upset stomach

⏱️ Dosage and Administration 30 words ▾

Directions Antacid Directions: take 1 tablet twice a day or as directed by a physician. Magnesium Supplement Directions: take 1 to 2 tablets daily or as directed by a physician.

⚠️ Warnings 87 words ▾

Warnings Ask a doctor before use if you have kidney disease Ask a doctor or pharmacist before use if you are taking a prescription drug. Antacids may interact with certain prescription drugs. Do not take more than 2 tablets in a 24 hour period or use the maximum dosage of this product for more than two weeks, except under the advice and supervision of a physician.

May have a laxative effect. If pregnant or breast-feeding, ask a health professional before use. Keep out of reach of children.

🧪 Active Ingredient 13 words ▾

Active Ingrendient (in each tablet) Magnesium Oxide 400 mg (241.3 mg elemental magnesium)

🧪 Inactive Ingredients 9 words ▾

Inactive Ingredients microcrystalline cellulose, sodium starch glycolate, stearic acid.

🎯 Purpose 2 words ▾

Purpose Antacid

📄 Do Not Use 39 words ▾

Do not take more than 2 tablets in a 24 hour period or use the maximum dosage of this product for more than two weeks, except under the advice and supervision of a physician. May have a laxative effect.

📄 Ask a Doctor Before Use If 10 words ▾

Ask a doctor before use if you have kidney disease

📄 Ask a Doctor or Pharmacist Before Use If 21 words ▾

Ask a doctor or pharmacist before use if you are taking a prescription drug. Antacids may interact with certain prescription drugs.

🤰 If Pregnant or Breast-Feeding 10 words ▾

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

📄 Keep Out of Reach of Children 6 words ▾

Keep out of reach of children.

📄 Other Information 18 words ▾

Other Information Magnesium content per tablet: 241.3 mg Store at controlled room temperature 59ºFto 86ºF (15ºC to 30ºC)

📄 Questions or Comments 4 words ▾

Questions or comments? 1-833-537-4679

📄 Package Label / Principal Display Panel 43 words ▾

NDC 81033-027-12 Magnesium Oxide 400 mg 241.3 mg Elemental Magnesium Dietary Supplement 120 Tablets Magnesium Oxide Tablets 400 mg

NDC 81033- 027 -01 Magnesium Oxide 400 mg 241.3 Elemental Magnesium per Tablet 100 Tablets (10x10 Unit-Dose) Magnesium Oxide Tablets Carton 100 Tablets (10x10)

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

Medicaid utilization by pack size

Medicaid (SDUD) totals over the four most recent reported quarters for every package size of this drug — handy when a specific package (e.g. a starter/titration pack) carries little or no Medicaid volume on its own.
120 tablets81033-0027-12 316 Rx · $3,965
1000 tablets this page81033-0027-01 No Medicaid data
Drug total (last 4 qtrs): 316 Rx · 17,483 units · $3,965 gross reimbursed
Tap a pack size to open its page. Source: CMS State Drug Utilization Data, last 4 quarters.
← 81033-0026-01 · Kesin 81033-0028-01 · Kesin →
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.