The short version
13 companies supply this market — deep enough that no single failure threatens the supply.
The numbers behind every sentence are on this page below — and the Watch button emails you when any of them move.
Magnesium Oxide
Magnesium Oxide · MAGNESIUM OXIDE 241.3 mg/1000mg · Tablet · Oral · Belleview Biosciences
NDC 84447-0001-12 · 120 mg in 1 BOTTLE, PLASTIC · OTC MONOGRAPH DRUG · View full market →
Medicare Part D
Medicare Part D does not cover over-the-counter drugs — by law it pays only for products requiring a prescription.
How Part D pricing works →NADAC price per unit
No NADAC pricing on file for this NDC — NADAC covers drugs dispensed by retail community pharmacies.
Supply fragility
Not scored — fragility is computed for NADAC-priced NDCs.
90-day shortage risk (model v2)
0.1%chance of a new FDA shortage posting for magnesium oxide (oral solid) in the next 90 days
sole-source market
For scale: the typical drug’s chance is about 0.1% — this one is in ordinary territory.
Backtested statistical model over the whole market, not this package alone. Model details →
Is this a "specialty" drug?
There's no legal definition — it meets 1 of 6 public criteria. Why that matters →
- Part D specialty tier
- Costs ≥ $950/fill
- Biologic (BLA)
- Injectable / infused
- Orphan-drug exclusivity
- REMS program · Xywav and Xyrem
Regulatory
- Application
- M001
- TE code
- —
- Approval date
- —
- Patents / exclusivity
- None on file
Shortage history
No FDA shortage reports for this drug or its presentations.
Recalls (this NDC)
No enforcement reports list this package NDC.
Manufacturers of Magnesium Oxide (Tablet)
| Labeler | Strength | First seen | Last seen |
|---|---|---|---|
| Aphena Pharma Solutions - Tennessee, LLC | MAGNESIUM OXIDE 400 mg/1 | Jul 15, 2026 | Sep 3, 2026 |
| Bryant Ranch Prepack | MAGNESIUM OXIDE 400 mg/1 | Jul 15, 2026 | Sep 3, 2026 |
| A-S Medication Solutions | MAGNESIUM OXIDE 400 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| Apnar Pharma Lp | MAGNESIUM OXIDE 400 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| Belleview Bioscience LLC | MAGNESIUM OXIDE 400 mg/400mg | Jul 15, 2026 | Sep 2, 2026 |
| Belleview Biosciences | MAGNESIUM OXIDE 241.3 mg/1000mg | Jul 15, 2026 | Sep 2, 2026 |
| Endo USA | MAGNESIUM OXIDE 253 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| Endo USA | MAGNESIUM OXIDE 400 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| Kesin Pharma | MAGNESIUM OXIDE 400 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| Marlex Pharmaceuticals Inc | MAGNESIUM OXIDE 400 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| Marlex Pharmaceuticals Inc. | MAGNESIUM OXIDE 420 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| Method Pharmaceuticals, LLC | MAGNESIUM OXIDE 400 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| Richmond Pharmaceuticals, Inc. | MAGNESIUM OXIDE 400 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| Richmond Pharmaceuticals, Inc. | MAGNESIUM OXIDE 420 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| Westminster Pharmaceuticals, LLC | MAGNESIUM OXIDE 400 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
Roster from daily NDC Directory diffs — first/last seen dates start July 2026.
Cite this page
DrugDashboards, "Magnesium Oxide — NDC 84447-0001-12," retrieved September 3, 2026, https://drugdashboards.com/drug/84447000112.
Free to cite with attribution — see how the data is put together.