METFORMIN ER 500 MG GASTRC-TB
For 30 tablets
Pharmacies pay
$8.13 filed
30 × $0.27102 per EA
CMS NADAC · nadac-national-average-drug-acquisition-cost-20261014.csv · eff. 2026-09-23 · as of 2026-10-14 · retrieved 2026-10-17
Medicare
We don’t know yet
No Medicare reference price. Part D: The Part D file flags this drug’s average spending per dosage unit as an outlier, so OpenBill does not use it as a reference price. Part B: This NDC is not in the current quarter’s Medicare Part B NDC-HCPCS crosswalk, so it has no Part B payment limit.
The spread
We don’t know yet
There is no Medicare figure to compare with, so there is no spread.
Cost-plus estimate
$14.35 estimated
$8.13 + $1.22 (15%) + $5.00 fee per fill = $14.35
This is a model, not a price any pharmacy quoted. Shipping is not included. How it is worked out
OpenBill calculation · nadac-national-average-drug-acquisition-cost-20261014.csv · NADAC eff. 2026-09-23 (file of 2026-10-14, retrieved 2026-10-17)
Open the interactive card Change the quantity, type what you were charged, and see every record in full.
What it is
METFORMIN ER 500 MG GASTRC-TB is how the CMS NADAC file names this product. The FDA NDC Directory lists it as “metformin hydrochloride” and “metformin hydrochloride extended-release tablets”, as its NDCs’ listings variously write the nonproprietary name.
FDA gives its dosage form as “tablet, extended release” and “tablet, film coated, extended release” and its route as oral.
FDA lists 6 labelers (the companies named on the label) for its NDCs, among them Ajanta Pharma USA Inc., Micro Labs Limited and ScieGen Pharmaceuticals, Inc.
FDA’s Established Pharmacologic Class for it is Biguanide.
The NADAC file of 2026-10-14 prices it under 6 NDCs (National Drug Codes).
NADAC classes it as a generic drug (rate-setting class G), and does not mark it as sold over the counter.
What pharmacies pay
Pharmacies pay $8.13 for 30 tablets (30 × $0.27102 per EA, rounded to the cent), by the CMS NADAC file of 2026-10-14; that price took effect on 2026-09-23. That is what pharmacies pay their suppliers, not what they charge you.
NADAC’s explanation code for it: 1, calculated from the most recently completed pharmacy survey.
What NADAC measures · Why 30 tablets · NADAC explanation codes
All 6 NDCs
- 27241-0240-01 · Ajanta Pharma USA Inc. · $0.27102 per EA · eff. 2026-09-23 filed
- 42571-0333-01 · Micro Labs Limited · $0.27102 per EA · eff. 2026-09-23 filed
- 50228-0445-01 · ScieGen Pharmaceuticals, Inc. · $0.27102 per EA · eff. 2026-09-23 filed
- 68180-0338-01 · Lupin Pharmaceuticals, Inc. · $0.27102 per EA · eff. 2026-09-23 filed
- 68462-0520-01 · GLENMARK PHARMACEUTICALS INC., USA · $0.27102 per EA · eff. 2026-09-23 filed
- 70010-0496-01 · Granules Pharmaceuticals Inc. · $0.27102 per EA · eff. 2026-09-23 filed
Other strengths, forms and brands
11 other products in the NADAC file share an FDA nonproprietary name with METFORMIN ER 500 MG GASTRC-TB.
| Product | Pharmacies pay per unit | Medicare per unit |
|---|---|---|
| METFORMIN ER 1,000 MG GASTR-TB | $0.3357 per EA filed | We don’t know yet |
| METFORMIN ER 1,000 MG OSM-TAB | $0.31418 per EA filed | $2.20305 per EA filed |
| METFORMIN ER 500 MG GASTRC-TB this page | $0.27102 per EA filed | We don’t know yet |
| METFORMIN ER 500 MG OSMOTIC TB | $0.1644 per EA filed | $2.20305 per EA filed |
| METFORMIN HCL 1,000 MG TABLET | $0.02315 per EA filed | $0.05643 per EA filed |
| METFORMIN HCL 500 MG TABLET | $0.01451 per EA filed | $0.05643 per EA filed |
| METFORMIN HCL 500 MG/5 ML SOLN | $0.3829 per ML filed | We don’t know yet |
| METFORMIN HCL 625 MG TABLET | $12.5266 per EA filed | $0.05643 per EA filed |
| METFORMIN HCL 750 MG TABLET | $14.605 per EA filed | $0.05643 per EA filed |
| METFORMIN HCL 850 MG TABLET | $0.02398 per EA filed | $0.05643 per EA filed |
| METFORMIN HCL ER 500 MG TABLET | $0.02838 per EA filed | $0.05999 per EA filed |
| METFORMIN HCL ER 750 MG TABLET | $0.05264 per EA filed | $0.05999 per EA filed |
Part D is one average per brand and generic name, over every strength and form.
CMS NADAC · nadac-national-average-drug-acquisition-cost-20261014.csv · eff. between 2025-12-17 and 2026-09-23 (4 dates) · as of 2026-10-14 · retrieved 2026-10-17
Medicare Part D · DSD_PTD_RY26_P04_V10_DY24_BGM.csv · eff. 2024-01-01 to 2024-12-31 · as of 2026-06-25 · retrieved 2026-10-18
Compared with its class
The middle of its 6 NDCs’ NADAC prices is $0.27102 per EA filed.
Of the 71 other products in FDA’s Biguanide class priced per EA, 59 have a higher middle NADAC price and 12 a lower one. The one in the middle is SYNJARDY XR 5-1,000 MG TABLET, at $5.61111 per EA filed (eff. 2026-09-23).
Prices are compared per unit, whatever the strength or dose, and a class is not a list of substitutes.
CMS NADAC · nadac-national-average-drug-acquisition-cost-20261014.csv · eff. 2026-09-23 · as of 2026-10-14 · retrieved 2026-10-17
What Medicare paid
We don’t know yet; the card above says why.
Which Medicare figure OpenBill compares · How Part D is matched · How Part B is matched
What to ask at the counter
None of these figures is your price: what you pay depends on your pharmacy, your insurance, coupons and discounts.
- What is your cash price for 30 tablets? Is it lower than what I would pay through my insurance?
- These are questions about price, not medical advice. Do not change or stop a medicine without talking to your prescriber or pharmacist.
Related pages
Its pharmacologic class
Related in the same class
- JANUMET XR 100-1,000 MG TABLET
- SYNJARDY XR 10-1,000 MG TABLET
- GLIPIZIDE-METFORMIN 2.5-250 MG
- XIGDUO XR 10 MG-1,000 MG TAB
- SYNJARDY 12.5-1,000 MG TABLET