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Live data · NADAC + Part D CY24 · reviewed daily

Methimazole

Thyroid Hormone Synthesis Inhibitor class · 8 generic manufacturers · 16 ANDAs filed at FDA.

First FDA approval2001-03-27
Generic availableYes · 8 mfrs
Shortage statusNone
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

$16.0M in CY2024 Part D spend1.4M claims · 422K beneficiaries · 329 plans surveyed

Lowest NADAC
$0.072/unit
20 NDCs benchmarked, lowest of all strengths.
Average NADAC
$0.084
Across all dosage forms in distribution.
Highest NADAC
$0.117
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 Methimazole used for?

Methimazole is a Thyroid Hormone Synthesis Inhibitor medication tracked in Medicare Part D.

Is there a generic for Methimazole?

Yes. 16 ANDAs filed at FDA, 8 generic manufacturers currently shipping.

How much does my plan pay for Methimazole?

Across 329 Part D plans, Methimazole averages $0.084/unit (NADAC). Lowest available: $0.072/unit. Highest in distribution: $0.117/unit.

Is Methimazole on the FDA shortage list?

No. Methimazole is not currently on the FDA Drug Shortage Database.

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.

Thyroid Hormone Synthesis Inhibitor1 alternative in D1
01
Propylthiouracil
Thyroid Hormone Synthesis Inhibitor
$0.277Lowest NADAC
3Generic mfrs
$3.1MCY24 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 (10 approvals on file) · NADAC unit costs: CMS NADAC weekly file (20 NDCs benchmarked) · Formulary tier and PA placement: CMS Part D Formulary file (329 plans) · Annualized spend, claims, beneficiaries: CMS Part D Spending Dashboard (CY2024) · Shortage status: FDA Drug Shortage Database · 340B exposure: HRSA OPAIS. Methodology and reproducibility notes on /methodology.