The short version
Only one company currently supplies this market — there is no backup if it stumbles.
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Ohtas Isan Antacid
calcium carbonate, sodium bicarbonate · CALCIUM CARBONATE 1 g/g; SODIUM BICARBONATE 1 g/g · Powder · Oral · Ohta's Isan Co.,ltd.
NDC 49631-0178-13 · 1 DOSE PACK in 1 BOX / 16 PACKET in 1 DOSE PACK / 1.3 g in 1 PACKET · 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.
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, sodium bicarbonate (Powder)
| Labeler | Strength | First seen | Last seen |
|---|---|---|---|
| Ohta's Isan Co.,ltd. | CALCIUM CARBONATE 1 g/g; SODIUM BICARBONATE 1 g/g | Jul 15, 2026 | Aug 31, 2026 |
Roster from daily NDC Directory diffs — first/last seen dates start July 2026.
Cite this page
DrugDashboards, "Ohtas Isan Antacid — NDC 49631-0178-13," retrieved September 3, 2026, https://drugdashboards.com/drug/49631017813.
Free to cite with attribution — see how the data is put together.