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What is the price of metformin in the United States?

Medicine prices in the United States, from Centers for Medicare & Medicaid Services. This source is answered live, so the page shows how to ask, not a number.

An official average or median published by a statistics office or regulator, not individual sales.

ProofPrice reads Centers for Medicare & Medicaid Services when you ask, so the answer is always the latest published. It comes with its period, its source and its licence; a range built from records is given only when at least 5 records sit behind it.

Ask for it: /api/v1/medicines?country=US&medicine=metformin

Where this comes from

Source
National Average Drug Acquisition Cost (NADAC), weekly, published by Centers for Medicare & Medicaid Services (CMS), U.S. Department of Health and Human Services
Licence
No separate licence text. Each NADAC dataset on data.medicaid.gov carries the licence field https://www.usa.gov/publicdomain/label/1.0/ (USAGov's page on U.S. Government works, which says: "Government work is something created by a U.S. government officer or employee as part of their official duties."). Data created by U.S. federal employees as part of their official duties is a U.S. Government work and is not subject to copyright. USAGov also states: "You cannot use government materials in a way that implies endorsement by a government agency, official, or employee."
Attribution
Source: National Average Drug Acquisition Cost (NADAC), Centers for Medicare & Medicaid Services, data.medicaid.gov. ProofPrice is not affiliated with or endorsed by CMS. Rates are passed on as published; the median across products and the 30-unit cost are calculated by ProofPrice.
How fresh the source is
A new weekly file (Wednesday) is published on data.medicaid.gov; each answer states the weekly file date and the date each rate took effect
Limits
NADAC is the average price retail community pharmacies pay to acquire a drug (an average of surveyed purchase invoices), NOT the price a patient pays: it leaves out the pharmacy's dispensing fee, mark-up and any insurance or coupon effect, so the counter price is higher. It is a national average, not a transaction, and says nothing about one pharmacy. CMS does not publish how many invoices stand behind each rate. Only drugs in the NADAC survey appear (outpatient drugs sold at retail pharmacies; no hospital, specialty-only or compounded products). A name query spans several strengths and forms: the headline is the published rate of one of them (the product in the middle when all matching NDCs are ranked by rate), named in the summary; every product and its rate is listed so the choice is visible. CMS does not publish how many invoices stand behind a rate, so no sample size is given (the number of NDCs is a count of products, not of purchases). The cost of 30 units is the unit cost multiplied by 30, shown for scale, not a price list.
Rule
A figure built from records is shown only when at least 5 records sit behind it; official statistics are shown as such, with their reference period. See how we earn trust and the method.

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Using the ProofPrice MCP server (pricepaid_medicine_prices): What is the price of metformin in the United States? Give the figure with its unit, the period it covers, the number of records where the source states one, and cite the source and licence.

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Information, not a valuation or offer. Ranges describe past recorded prices.