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Live data · NADAC + Part D CY24 · reviewed daily

Water (Bacteriostatic Water)

Prostacycline Vasodilator class · 0 generic manufacturers · 0 ANDAs filed at FDA.

First FDA approval1970-09-10
Generic availableNo (brand-only)
Shortage statusActive shortage
340B exposureunknown
Last updated
NADAC: weekly (every Wed)Part D Formulary: quarterlyPart D Spend: annual (CY24)Orange Book: weeklyShortages: daily
At a glance · the numbers a plan sponsor wants on screen one
Lowest NADAC
$0.321/unit
4 NDCs benchmarked, lowest of all strengths.
Average NADAC
$0.321
Across all dosage forms in distribution.
Highest NADAC
$0.321
Range is tight.
Plans with PA
0 / 329
Zero PA friction — switching is purely formulary.

Questions a plan sponsor actually asks.

FAQPage schema9 entries indexed · 4 visible
What is Water used for?

Water is a Prostacycline Vasodilator medication tracked in Medicare Part D.

Is there a generic for Water?

No. Water is brand-only with no generic equivalents currently in market.

How much does my plan pay for Water?

Across 329 Part D plans, Water averages $0.321/unit (NADAC). Lowest available: $0.321/unit. Highest in distribution: $0.321/unit.

Is Water on the FDA shortage list?

Yes. Water is currently listed as an active FDA shortage.

5 additional drug-specific questions are indexed in the page's FAQPage schema for search engines and LLM crawlers, beyond what renders visually above. View page source for the complete JSON-LD.

Same class. Different math.

Prostacycline Vasodilator3 alternatives in D1
01
Epoprostenol
Brand: FLOLAN
Lowest NADAC
4Generic mfrs
$982,798CY24 Part D spend
Compare →
02
Treprostinil
Brand: Orenitram
Lowest NADAC
4Generic mfrs
$1.24BCY24 Part D spend
Compare →
03
Water Solution
Brand: DILUENT
Lowest NADAC
0Generic mfrs
CY24 Part D spend
Compare →

Sources · every number above traces back.

Last refresh30 May 2026

Drug identity, dosage forms, brand names: openFDA NDC Directory · First approval, ANDA history: FDA Orange Book · NADAC unit costs: CMS NADAC weekly file (4 NDCs benchmarked) · Formulary tier and PA placement: CMS Part D Formulary file (329 plans) · Annualized spend, claims, beneficiaries: CMS Part D Spending Dashboard · Shortage status: FDA Drug Shortage Database · 340B exposure: HRSA OPAIS. Methodology and reproducibility notes on /methodology.