How Drug Prices Are Set in the United States

2026-03-15 · 8 min read · Updated 2026-04-10

The Drug Pricing Supply Chain

Drug pricing in the United States involves a complex web of manufacturers, wholesalers, pharmacy benefit managers (PBMs), insurers, and pharmacies. Unlike most consumer goods, the price you pay at the pharmacy counter often bears little resemblance to the manufacturer's list price.

Manufacturer List Price (WAC)

The Wholesale Acquisition Cost (WAC) is the manufacturer's published list price to wholesalers. This is the starting point for drug pricing but is rarely the actual price paid by anyone in the supply chain. Manufacturers set WAC based on research and development costs, market competition, and perceived value of the drug.

Wholesaler and Distributor Markups

Major drug distributors like McKesson, AmerisourceBergen, and Cardinal Health purchase drugs from manufacturers and distribute them to pharmacies. They typically add a small markup of 1-3% over the WAC price.

The Role of PBMs

Pharmacy Benefit Managers negotiate rebates with manufacturers on behalf of insurance plans. These rebates can be substantial — sometimes 30-50% of the WAC price for brand-name drugs. However, these savings don't always reach the consumer directly.

What is NADAC?

The National Average Drug Acquisition Cost (NADAC) represents what pharmacies actually pay to acquire drugs. Published by the Centers for Medicare & Medicaid Services (CMS), NADAC is based on a monthly survey of retail pharmacies. This is the data source used by DrugPricePeek to provide transparent pricing information.

How NADAC is Calculated

CMS surveys a random sample of retail community pharmacies each month. The NADAC is calculated as the average invoice price paid by pharmacies for each drug, weighted by the volume of purchases. This gives a reliable picture of actual acquisition costs across the country.

Why Prices Vary

Even for the same drug, prices can vary dramatically between pharmacies due to:

Different wholesaler contracts and purchasing volumes
Pharmacy markup policies (independent vs. chain)
Insurance plan negotiations and formulary placement
Geographic location and local competition
Whether the patient has insurance, uses a discount card, or pays cash

Generic vs. Brand Pricing

Generic drugs are typically 80-85% cheaper than their brand-name equivalents. After a brand-name drug's patent expires (usually 20 years from filing), generic manufacturers can produce the same medication. The FDA requires generics to be bioequivalent, meaning they work the same way in the body.

The Generic Cliff

When the first generic competitor enters the market, prices typically drop by 20-30%. As more generics are approved (often 5-10+ manufacturers for popular drugs), prices can fall by 80-95% compared to the original brand price. This competitive dynamic is why pharmacies and insurers strongly prefer generic substitution when available.

Recent Policy Changes

The Inflation Reduction Act of 2022 brought significant changes to drug pricing, including Medicare's ability to negotiate prices for certain high-cost drugs, a $2,000 annual out-of-pocket cap for Medicare Part D beneficiaries, and penalties for manufacturers who raise prices faster than inflation.

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DrugPricePeek Editorial TeamData Specialists

The DrugPricePeek editorial team aggregates and verifies drugs data from CMS NADAC & Medicare Part D. Every statistic on this site is cross-referenced against the official source before publication, with quarterly re-verification cycles.

✓ Sourced from CMS NADAC & Medicare Part D✓ Quarterly review✓ No paid placements

Read our full methodology or contact us with corrections.

Frequently Asked Questions

Who sets drug prices in the US?

Drug manufacturers set the initial list price (WAC). From there, prices are negotiated by wholesalers, PBMs, insurers, and pharmacies. Unlike many countries, the US government historically has not directly negotiated drug prices, though the Inflation Reduction Act now allows Medicare to negotiate prices for some drugs.

What is NADAC and why does it matter?

NADAC (National Average Drug Acquisition Cost) is the average price pharmacies pay to buy drugs, published monthly by CMS. It matters because it represents the closest thing to a transparent "true cost" in the opaque drug pricing chain, helping consumers and policymakers understand actual drug costs.

Why are brand-name drugs so expensive?

Brand-name drugs carry high prices partly due to R&D costs (averaging $1-2 billion per drug), but also due to patent monopolies that prevent competition, marketing expenses, and the complex rebate system that obscures true costs. PBM negotiations and rebates reduce the effective price, but savings often don't reach consumers.

How much cheaper are generic drugs?

Generic drugs are typically 80-85% cheaper than brand-name equivalents. With multiple generic competitors, prices can drop 90-95%. The FDA requires generics to have the same active ingredients, strength, and effectiveness as the original brand.

Will drug prices go down with the Inflation Reduction Act?

The Inflation Reduction Act allows Medicare to negotiate prices for certain high-cost drugs starting in 2026, caps Medicare Part D out-of-pocket costs at $2,000/year, and penalizes manufacturers for above-inflation price increases. These changes will primarily benefit Medicare beneficiaries directly.

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