{ "query": { "country": "US", "medicine": "metformin", "matched_name": "METFORMIN" }, "status": "ok", "price": { "currency": "USD", "unit": "per tablet", "value": 0.02398, "measure": "average", "median": null, "typical_low": null, "typical_high": null, "min": null, "max": null }, "sample_size": null, "period": { "from": "2025-12-17", "to": "2026-10-14" }, "confidence": "high", "price_type": "official_statistic", "statistic": { "measure": "average", "reference_period": "NADAC weekly file as of 2026-10-14 (rates effective 2025-12-17 to 2026-09-23)", "note": "NADAC is the pharmacy's average acquisition cost, not the patient's price." }, "as_of": "2026-10-14T21:28:56.679Z", "source": { "id": "us-nadac", "name": "National Average Drug Acquisition Cost (NADAC), weekly", "publisher": "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.\"", "licence_url": "https://www.usa.gov/publicdomain/label/1.0/", "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.", "url": "https://data.medicaid.gov/dataset/fbb83258-11c7-47f5-8b18-5f8e79f7e704" }, "method": "NADAC (National Average Drug Acquisition Cost) is calculated by the Centers for Medicare & Medicaid Services from a survey of invoice prices that U.S. retail community pharmacies pay to buy drugs, and published weekly per National Drug Code (NDC, one packaged product). We read the newest weekly file live from data.medicaid.gov, keep the NDCs whose description starts with the medicine name (narrowed by any strength, form or extra word you gave), in the most common pricing unit (tablet or capsule, mL or gram), and pass on one published per-unit rate unchanged. When the name spans several strengths or forms, we show the rate of the product in the middle when the matching NDCs are ranked by rate, name that product, and list every product with its own rate; no average or range is calculated across products. This is what pharmacies pay to acquire the drug, not what a patient pays at the counter.", "method_url": "https://proofprice.com/method", "summary": "US retail pharmacies paid on average about $0.02398 per tablet to acquire METFORMIN HCL 850 MG TABLET (one of 11 matching strengths and forms of METFORMIN, the one in the middle by rate; their published rates run from $0.01451 to $14.61 per tablet, so give a strength for an exact figure). This is the pharmacy's acquisition cost (NADAC), not the price a patient pays at the counter. At that unit cost, 30 tablets would cost the pharmacy roughly $0.72. Official average published by Centers for Medicare & Medicaid Services (CMS), U.S. Department of Health and Human Services for NADAC weekly file as of 2026-10-14 (rates effective 2025-12-17 to 2026-09-23).", "notice": "Information, not a valuation or offer. Ranges describe past recorded prices.", "extra": { "pricing_unit": "EA", "what_the_figure_is": "NADAC: the national average price retail community pharmacies pay to acquire this drug per unit, from a CMS survey of purchase invoices. It excludes the pharmacy's dispensing fee and mark-up and any insurance or coupon effect.", "headline_basis": "the published NADAC rate of METFORMIN HCL 850 MG TABLET, the product in the middle when all 244 matching NDCs are ranked by rate; no average is calculated across strengths, so give a strength for an exact figure", "headline_product": "METFORMIN HCL 850 MG TABLET", "weekly_file_date": "2026-10-14", "rates_effective_from": "2025-12-17", "rates_effective_to": "2026-09-23", "days_since_weekly_file": 0, "products_matched": 11, "ndc_rows_used": 244, "typical_pack": { "note": "Unit cost multiplied by the number of units; arithmetic for scale only, not a published pack price.", "cost_for_30_units": "$0.72", "cost_for_30_units_usd": 0.7194, "cost_for_90_units": "$2.16", "cost_for_90_units_usd": 2.1582, "unit": "tablet" }, "products": [ { "description": "METFORMIN ER 1,000 MG GASTR-TB", "nadac_per_unit_usd": 0.3357, "pricing_unit": "EA", "ndcs": 6, "rate": "generic", "over_the_counter": false, "rate_effective": "2026-09-23", "cost_for_30_units_usd": 10.071 }, { "description": "METFORMIN ER 1,000 MG OSM-TAB", "nadac_per_unit_usd": 0.31418, "pricing_unit": "EA", "ndcs": 9, "rate": "generic", "over_the_counter": false, "rate_effective": "2026-09-23", "cost_for_30_units_usd": 9.4254 }, { "description": "METFORMIN ER 500 MG GASTRC-TB", "nadac_per_unit_usd": 0.27102, "pricing_unit": "EA", "ndcs": 6, "rate": "generic", "over_the_counter": false, "rate_effective": "2026-09-23", "cost_for_30_units_usd": 8.1306 }, { "description": "METFORMIN ER 500 MG OSMOTIC TB", "nadac_per_unit_usd": 0.1644, "pricing_unit": "EA", "ndcs": 9, "rate": "generic", "over_the_counter": false, "rate_effective": "2026-09-23", "cost_for_30_units_usd": 4.932 }, { "description": "METFORMIN HCL 1,000 MG TABLET", "nadac_per_unit_usd": 0.02315, "pricing_unit": "EA", "ndcs": 56, "rate": "generic", "over_the_counter": false, "rate_effective": "2026-09-23", "cost_for_30_units_usd": 0.6945 }, { "description": "METFORMIN HCL 500 MG TABLET", "nadac_per_unit_usd": 0.01451, "pricing_unit": "EA", "ndcs": 57, "rate": "generic", "over_the_counter": false, "rate_effective": "2026-09-23", "cost_for_30_units_usd": 0.4353 }, { "description": "METFORMIN HCL 625 MG TABLET", "nadac_per_unit_usd": 12.5266, "pricing_unit": "EA", "ndcs": 3, "rate": "generic", "over_the_counter": false, "rate_effective": "2026-02-25", "cost_for_30_units_usd": 375.798 }, { "description": "METFORMIN HCL 750 MG TABLET", "nadac_per_unit_usd": 14.605, "pricing_unit": "EA", "ndcs": 3, "rate": "generic", "over_the_counter": false, "rate_effective": "2026-02-25", "cost_for_30_units_usd": 438.15 }, { "description": "METFORMIN HCL 850 MG TABLET", "nadac_per_unit_usd": 0.02398, "pricing_unit": "EA", "ndcs": 47, "rate": "generic", "over_the_counter": false, "rate_effective": "2026-09-23", "cost_for_30_units_usd": 0.7194 }, { "description": "METFORMIN HCL ER 500 MG TABLET", "nadac_per_unit_usd": 0.02838, "pricing_unit": "EA", "ndcs": 31, "rate": "generic", "over_the_counter": false, "rate_effective": "2026-09-23", "cost_for_30_units_usd": 0.8514 }, { "description": "METFORMIN HCL ER 750 MG TABLET", "nadac_per_unit_usd": 0.05264, "pricing_unit": "EA", "ndcs": 17, "rate": "generic", "over_the_counter": false, "rate_effective": "2026-09-23", "cost_for_30_units_usd": 1.5792 } ], "other_pricing_units": [ { "description": "METFORMIN HCL 500 MG/5 ML SOLN", "nadac_per_unit_usd": 0.3829, "pricing_unit": "ML" } ] }, "answer_id": "ans_9405d8a71c6bfde22592", "method_version": "1", "retrieved_at": "2026-10-14T21:28:56.679Z", "evidence": { "type": "official_statistic", "label": "Official published average", "meaning": "One average or median that a statistics office or regulator publishes for a reference period: it describes a group, not a distribution, and says nothing about any single price." } }