The short version
Only one company currently supplies this market — there is no backup if it stumbles.
The numbers behind every sentence are on this page below — and the Watch button emails you when any of them move.
Diurex Water Pills
Caffeine, magnesium salicylate · MAGNESIUM SALICYLATE 162.5 mg/1; CAFFEINE 50 mg/1 · Tablet, Coated · Oral · Kobayashi Healthcare International, Inc.
NDC 52389-0306-36 · 2 BLISTER PACK in 1 CARTON / 18 TABLET, COATED in 1 BLISTER PACK · 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 · Opioid Analgesic REMS Shared System REMS
Regulatory
- Application
- M027
- 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 Caffeine, magnesium salicylate (Tablet, Coated)
| Labeler | Strength | First seen | Last seen |
|---|---|---|---|
| Kobayashi Healthcare International, Inc. | MAGNESIUM SALICYLATE 162.5 mg/1; CAFFEINE 50 mg/1 | Aug 26, 2026 | Sep 2, 2026 |
| Kobayashi Healthcare International, Inc. | MAGNESIUM SALICYLATE 50 mg/1; CAFFEINE 162.5 mg/1 | Jul 22, 2026 | Aug 19, 2026 |
| Kobayashi Healthcare International, Inc. | CAFFEINE 50 mg/1; MAGNESIUM SALICYLATE 162.5 mg/1 | Jul 15, 2026 | Jul 15, 2026 |
Roster from daily NDC Directory diffs — first/last seen dates start July 2026.
Cite this page
DrugDashboards, "Diurex Water Pills — NDC 52389-0306-36," retrieved September 3, 2026, https://drugdashboards.com/drug/52389030636.
Free to cite with attribution — see how the data is put together.