The short version
Just 2 companies supply this market — thin enough that a single exit would be felt immediately.
The numbers behind every sentence are on this page below — and the Watch button emails you when any of them move.
Maximum Strength Calcium Carbonate 1000mg
Calcium Carbonate Chewable Tablets · CALCIUM CARBONATE 1000 mg/1 · Tablet, Chewable · Oral · Cvs Health Corp
NDC 51316-0540-66 · 160 TABLET, CHEWABLE in 1 BOTTLE · 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)
0.2%chance of a new FDA shortage posting for calcium carbonate (oral solid) in the next 90 days
13 Class I/II recall(s) in 12 months · sole-source market · price up 1% YoY
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 Calcium Carbonate Chewable Tablets (Tablet, Chewable)
| Labeler | Strength | First seen | Last seen |
|---|---|---|---|
| Cvs Health Corp | CALCIUM CARBONATE 1000 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| Cvs Health Corp | CALCIUM CARBONATE 750 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| CVS Pharmacy. Inc. | CALCIUM CARBONATE 1000 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, "Maximum Strength Calcium Carbonate 1000mg — NDC 51316-0540-66," retrieved September 3, 2026, https://drugdashboards.com/drug/51316054066.
Free to cite with attribution — see how the data is put together.