The short version
Just 3 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.
ZzzQuil Nighttime Sleep-Aid
Diphenhydramine Hydrochloride · DIPHENHYDRAMINE HYDROCHLORIDE 25 mg/1 · Capsule, Gelatin Coated · Oral · The Procter & Gamble Manufacturing Company
NDC 37000-0501-02 · 2 CAPSULE, GELATIN 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.
90-day shortage risk (model v2)
0.1%chance of a new FDA shortage posting for diphenhydramine hydrochloride (oral solid) in the next 90 days
sole-source market · price up 4% 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 →
Regulatory
- Application
- M010
- 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 Diphenhydramine Hydrochloride (Capsule, Gelatin Coated)
| Labeler | Strength | First seen | Last seen |
|---|---|---|---|
| The Procter & Gamble Manufacturing Company | DIPHENHYDRAMINE HYDROCHLORIDE 25 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| Catalent Ontario Limited | DIPHENHYDRAMINE HYDROCHLORIDE 25 mg/1 | Jul 15, 2026 | Aug 31, 2026 |
| Catalent Ontario Limited | DIPHENHYDRAMINE HYDROCHLORIDE 50 mg/1 | Jul 15, 2026 | Aug 29, 2026 |
| Patheon Softgels Inc. | DIPHENHYDRAMINE HYDROCHLORIDE 50 mg/21 | Jul 15, 2026 | Aug 19, 2026 |
Roster from daily NDC Directory diffs — first/last seen dates start July 2026.
Cite this page
DrugDashboards, "ZzzQuil Nighttime Sleep-Aid — NDC 37000-0501-02," retrieved September 3, 2026, https://drugdashboards.com/drug/37000050102.
Free to cite with attribution — see how the data is put together.