The short version
31 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.
Diphenhydramine HCl · DIPHENHYDRAMINE HYDROCHLORIDE 25 mg/1 · Tablet, Film Coated · Oral · Dolgencorp, Llc
NDC 55910-0293-08 · 2 BLISTER PACK in 1 CARTON / 12 TABLET, FILM COATED in 1 BLISTER PACK · OTC MONOGRAPH DRUG · View full market →
31 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.
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 →No NADAC pricing on file for this NDC — NADAC covers drugs dispensed by retail community pharmacies.
Not scored — fragility is computed for NADAC-priced NDCs.
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 →
No FDA shortage reports for this drug or its presentations.
No enforcement reports list this package NDC.
| Labeler | Strength | First seen | Last seen |
|---|---|---|---|
| Amerisource Bergen | DIPHENHYDRAMINE HYDROCHLORIDE 25 mg/1 | Jul 15, 2026 | Sep 3, 2026 |
| Better Living Brands, LLC | DIPHENHYDRAMINE HYDROCHLORIDE 25 mg/1 | Jul 15, 2026 | Sep 3, 2026 |
| CVS Pharmacy | DIPHENHYDRAMINE HYDROCHLORIDE 25 mg/1 | Jul 15, 2026 | Sep 3, 2026 |
| Dolgencorp, Llc | DIPHENHYDRAMINE HYDROCHLORIDE 25 mg/1 | Jul 15, 2026 | Sep 3, 2026 |
| Family Dollar Services Inc | DIPHENHYDRAMINE HYDROCHLORIDE 25 mg/1 | Jul 15, 2026 | Sep 3, 2026 |
| Rite Aid Corporation | DIPHENHYDRAMINE HYDROCHLORIDE 25 mg/1 | Jul 15, 2026 | Sep 3, 2026 |
| Wal-Mart Stores Inc | DIPHENHYDRAMINE HYDROCHLORIDE 25 mg/1 | Jul 15, 2026 | Sep 3, 2026 |
| Walgreen Company | DIPHENHYDRAMINE HYDROCHLORIDE 25 mg/1 | Jul 15, 2026 | Sep 3, 2026 |
| WinCo Foods, LLC | DIPHENHYDRAMINE HYDROCHLORIDE 25 mg/1 | Jul 15, 2026 | Sep 3, 2026 |
| A-S Medication Solutions | DIPHENHYDRAMINE HYDROCHLORIDE 25 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| Army And Air Force Exchange Service | DIPHENHYDRAMINE HYDROCHLORIDE 25 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| Costco Wholesale Corporation | DIPHENHYDRAMINE HYDROCHLORIDE 25 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| Cvs Pharmacy | DIPHENHYDRAMINE HYDROCHLORIDE 25 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| Cvs Woonsocket Prescription Center, Incorporated | DIPHENHYDRAMINE HYDROCHLORIDE 25 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| Cvs Woonsocket Prescription Center, Incorporated | DIPHENHYDRAMINE HYDROCHLORIDE 50 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| H E B | DIPHENHYDRAMINE HYDROCHLORIDE 25 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| Health Department, Oklahoma State | DIPHENHYDRAMINE HYDROCHLORIDE 25 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| Invahealth Inc | DIPHENHYDRAMINE HYDROCHLORIDE 25 mg/25mg | Jul 15, 2026 | Sep 2, 2026 |
| Lidl US LLC | DIPHENHYDRAMINE HYDROCHLORIDE 25 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| Major Pharmaceuticals | DIPHENHYDRAMINE HYDROCHLORIDE 25 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| Meijer Distribution Inc | DIPHENHYDRAMINE HYDROCHLORIDE 25 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| Proficient Rx LP | DIPHENHYDRAMINE HYDROCHLORIDE 25 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| Publix Super Markets Inc | DIPHENHYDRAMINE HYDROCHLORIDE 25 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| Rugby Laboratories | DIPHENHYDRAMINE HYDROCHLORIDE 25 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| Sam's West Inc | DIPHENHYDRAMINE HYDROCHLORIDE 25 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| Topco Associates, LLC | DIPHENHYDRAMINE HYDROCHLORIDE 25 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| Unifirst First Aid Corporation | DIPHENHYDRAMINE HYDROCHLORIDE 25 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| Walgreen Company | DIPHENHYDRAMINE HYDROCHLORIDE 50 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| Walmart Inc. | DIPHENHYDRAMINE HYDROCHLORIDE 25 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| Cardinal Health 110, LLC. DBA Leader | DIPHENHYDRAMINE HYDROCHLORIDE 25 mg/1 | Jul 15, 2026 | Aug 31, 2026 |
| Strategic Sourcing Services LLC | DIPHENHYDRAMINE HYDROCHLORIDE 25 mg/1 | Jul 15, 2026 | Aug 31, 2026 |
| L.N.K. International, Inc. | DIPHENHYDRAMINE HYDROCHLORIDE 25 mg/1 | Jul 15, 2026 | Aug 28, 2026 |
| United Natural Foods, Inc. dba UNFI | DIPHENHYDRAMINE HYDROCHLORIDE 25 mg/1 | Jul 15, 2026 | Aug 28, 2026 |
Roster from daily NDC Directory diffs — first/last seen dates start July 2026.
DrugDashboards, "Allergy Relief — NDC 55910-0293-08," retrieved September 3, 2026, https://drugdashboards.com/drug/55910029308.
Free to cite with attribution — see how the data is put together.