DrugDashboards

Zarontin

Ethosuximide · ETHOSUXIMIDE 250 mg/1 · Capsule · Oral · Parke-Davis Div of Pfizer Inc

NDC 00071-0237-24 · 100 CAPSULE in 1 BOTTLE · NDA · View full market →

The short version

6 companies supply this market — a reasonable cushion if one runs into trouble. The price has fallen 63% in a year, to $1.31 per unit — and generics that get this cheap tend to get abandoned rather than defended. Put together: this looks like a healthy supply — the boring kind, which is exactly what you want.

The numbers behind every sentence are on this page below — and the Watch button emails you when any of them move.

One drug, every price

The same NDC has different prices depending on who is paying. Units differ between rungs — compare within a rung over time, not rung against rung, unless the units match.

ⓘ How this was built
Data sources
  • CMS NADAC (pharmacy acquisition, weekly)
  • CMS Part B ASP quarterly payment limits
  • CMS Maximum Fair Prices (IRA negotiated, NDC-level)
  • Medicare Part D Spending by Drug (data.cms.gov, name-matched)
  • VA FSS / Big4 federal contract prices (va.gov, twice monthly)
  • ACA Federal Upper Limits + weighted AMP (data.medicaid.gov, monthly)
  • California SB-17 WAC filings (list price, per package)
Method

Each rung is the newest figure for this NDC from one federal price system, shown with its own unit. Part D is matched by drug name because CMS publishes no NDCs there; it is gross spending, before confidential rebates.

Pipeline and calculations built by Claude (Fable 5) from the public datasets above. Educational only — verify against primary sources before acting.

  • Pharmacies pay (NADAC)$1.31per EAinvoice-surveyed acquisition cost · Jan 1, 2026
  • Part D plans paid (avg)$1.13per dosage unitgross, before rebates — matched by drug name · 2024
  • Part D point of sale (median)$1.37per unitnegotiated price across 12 plans — before rebates · Apr 1, 2026
  • Federal ceiling (Big4)$0.7030per unitPfizer Inc. · Jan 1, 202654% of what pharmacies pay — a deeper discount than 86% of drugs with this benchmark
  • Medicaid generic ceiling (FUL)$0.2483per CAPweighted avg manufacturer price $0.1110 · Aug 1, 202619% of what pharmacies pay — a deeper discount than 95% of drugs with this benchmark

Medicare Part D

All Part D pricing →
ⓘ 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
$1.37per unit
middle half $1.37$1.43 · 12 plans · Apr 1, 2026
Est. net of rebates
$0.8246–$1.03
brand drug — est. 25-40% rebate off the price at left
Coverage & restrictions
0%of plans cover it
tier 4 · prior auth 0% · step therapy 0% · qty limit 0%

*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

$0$2.00$4.00Jul 2013Jan 2026$1.31
13 price points · per EA · last surveyed Invalid Date · dashed = manufacturer avg (WAMP)Source: CMS NADAC

Estimated fill cost

#30 count
$39.26
#90 count
$117.77

Estimates: latest NADAC unit price × quantity. Pharmacy acquisition cost only — excludes dispensing fees, markup, and insurance terms.

Medicaid spend (2025)

$4,201
44 prescriptions paid by Medicaid nationally · all Medicaid spend →

Supply fragility

0Low risk

Nothing here is signaling trouble: several manufacturers, no current shortage, no recent serious recalls, stable pricing. In drug supply, boring is the good outcome.

The score counts pressure that is already visible — fewer makers, shortages, recalls, falling prices. 0 means none of it; 100 means all of it at once. Recomputed daily · as of Sep 3, 2026

90-day shortage risk (model v2)

0.1%chance of a new FDA shortage posting for ethosuximide (oral solid) in the next 90 days

price up 12% YoY · 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 →

Where it's made

Establishments this product's FDA label declares, located via FDA registration data. How we built this →

Regulatory

Application
NDA012380
TE code
AB
Approval date
Jan 1, 1982
Patents / exclusivity
None on file

Shortage history

No FDA shortage reports for this drug or its presentations.

Recalls (this NDC)

  • Class III · TerminatedSep 12, 2019
    Pfizer Inc.Labeling: Incorrect or Missing Lot and/or Exp Date. The expiry date on the product label is incorrect. The label states an expiry date of 09/2021 when it should be 09/2020.

Manufacturers of Ethosuximide (Capsule)

LabelerStrengthFirst seenLast seen
Catalent Pharma Solutions, LLCETHOSUXIMIDE 250 mg/1Jul 15, 2026Sep 2, 2026
Chartwell RX, LLCETHOSUXIMIDE 250 mg/1Jul 15, 2026Sep 2, 2026
Parke-Davis Div of Pfizer IncETHOSUXIMIDE 250 mg/1Jul 15, 2026Sep 2, 2026
Patheon Softgels Inc.ETHOSUXIMIDE 250 mg/1Jul 15, 2026Sep 2, 2026
Strides Pharma Science LimitedETHOSUXIMIDE 250 mg/1Jul 15, 2026Sep 2, 2026
Epic Pharma, LLCETHOSUXIMIDE 250 mg/1Jul 15, 2026Aug 28, 2026

Roster from daily NDC Directory diffs — first/last seen dates start July 2026.

Cite this page

DrugDashboards, "Zarontin — NDC 00071-0237-24," retrieved September 3, 2026, https://drugdashboards.com/drug/00071023724.

Free to cite with attribution — see how the data is put together.