The short version
4 companies supply this market — a reasonable cushion if one runs into trouble.
The numbers behind every sentence are on this page below — and the Watch button emails you when any of them move.
Xifaxan
rifaximin · RIFAXIMIN 550 mg/1 · Tablet · Oral · Cardinal Health 107, LLC
NDC 55154-6777-08 · 360 TABLET in 1 BOTTLE, PLASTIC · NDA · View full market →
Medicare Part D
All Part D pricing →Matched to CMS's representative package for this drug (NDC 65649-0303-02) — same generic, strength, and dosage form. CMS prices one NDC per drug concept, not every package.
ⓘ How this was built
Data sources
- CMS quarterly Prescription Drug Plan Formulary & Pricing files (SPUF)
Method
Negotiated 30-day point-of-sale unit prices and formulary terms aggregated across every unsuppressed Part D and MA-PD plan for the quarter shown. Point of sale means gross of confidential rebates. CMS publishes one representative NDC per drug concept (RxCUI) rather than every package, so these figures come from CMS's representative package for the same drug — matched on generic name, strength, and dosage form. Estimated from MedPAC's program-wide rebate aggregates (June 2023: DIR = 29% of gross Part D spending; brand rebates ≈ 25–40% of gross, generics minimal). Actual rebates are confidential and vary widely by drug — this is a range, not a fact about this drug.
Pipeline and calculations built by Claude (Fable 5) from the public datasets above. Educational only — verify against primary sources before acting.
Plans pay at point of saleⓘ
$66.17per unit
middle half $62.81–$67.83 · 5,496 plans · Apr 1, 2026
Est. net of rebatesⓘ
$39.70–$49.62
brand drug — est. 25-40% rebate off the price at left
Coverage & restrictions
100%of plans cover it
tier 5 · prior auth 97% · step therapy 0% · qty limit 53%
*No drug-level rebate is public — the estimate applies MedPAC's program-wide brand rebate range to this drug's gross price. Tracked here for 10 quarters since 2024.
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 rifaximin (oral solid) in the next 90 days
sole-source market
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 · avg $2,779.31 per prescription
- Biologic (BLA)
- Injectable / infused
- Orphan-drug exclusivity
- REMS program
Regulatory
- Application
- NDA021361
- TE code
- AB
- Approval date
- May 25, 2004
- Patents / exclusivity
- 25 patents, 0 exclusivities
| Type | Number / code | Expires |
|---|---|---|
| patent | 8642573 | Oct 2, 2029 |
| patent | 8969398 | Oct 2, 2029 |
| patent | 7928115 | Jul 24, 2029 |
| patent | 8829017 | Jul 24, 2029 |
| patent | 9421195 | Jul 24, 2029 |
| patent | 8946252 | Jul 24, 2029 |
| patent | 10335397 | Jul 24, 2029 |
| patent | 9629828 | Jul 24, 2029 |
| patent | 10314828 | Jul 24, 2029 |
| patent | 10709694 | Jul 24, 2029 |
| patent | 8309569 | Jul 18, 2029 |
| patent | 11779571 | Feb 26, 2029 |
Shortage history
No FDA shortage reports for this drug or its presentations.
Recalls (this NDC)
No enforcement reports list this package NDC.
Manufacturers of rifaximin (Tablet)
| Labeler | Strength | First seen | Last seen |
|---|---|---|---|
| A-S Medication Solutions | RIFAXIMIN 200 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| Alfasigma SpA | RIFAXIMIN 550 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| Cardinal Health 107, LLC | RIFAXIMIN 550 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| Salix Pharmaceuticals, Inc. | RIFAXIMIN 200 mg/1 | Jul 15, 2026 | Sep 2, 2026 |
| Salix Pharmaceuticals, Inc. | RIFAXIMIN 550 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, "Xifaxan — NDC 55154-6777-08," retrieved September 3, 2026, https://drugdashboards.com/drug/55154677708.
Free to cite with attribution — see how the data is put together.