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Frequency of Generic Drug Price Spikes and Impact on Medicaid Spending

5/4/2021

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By ​Aayan N. Patel, Aaron S. Kesselheim, and Benjamin N. Rome

Generic drugs account for 90% of filled prescriptions and have saved the US healthcare system more than $1 trillion in the past decade. While generally much less expensive than brand-name drugs, spikes in the prices of certain generic drugs have been widely reported, resulting in higher patient out-of-pocket contributions and excess spending by government programs like Medicaid.

In new research published in Health Affairs, we examined Medicaid prescription drug spending and found that 1 in 5 generic drugs doubled in price between 2014 and 2017, though the frequency of price spikes decreased over this period and was improved from studies of prior time periods. Price spikes were most common among injectable drugs, drugs with three or fewer manufacturers, and drugs experiencing shortages.

These generic drug price spikes resulted in roughly $1.5 billion in excess Medicaid spending from 2014 to 2016, representing 4.2% of Medicaid spending on generic drugs during this period. Since 2017, the Medicaid Drug Rebate Program requires generic drug manufacturers to provide additional rebates if prices increase faster than inflation (similar to brand-name drugs), but generic drug price spikes will continue to impact out-of-pocket costs and spending for non-Medicaid patients.

A prior study that found that the frequency of generic drug price spikes had increased from 2007 to 2013, and the new study suggests this trend has reversed in recent years, possibly because of increased public scrutiny and efforts by Congress and the US Food and Drug Administration to increase generic competition.

While most price spikes were among generic drugs with 3 or fewer manufacturers, 1 in 10 drugs with 8 or more manufacturers experienced a price spike, suggesting competition alone may not be sufficient to eliminate price spikes. The US Department of Justice and forty-six states have ongoing investigations into multiple generic drug manufacturers about collusive activity that allegedly occurred in late 2013 to 2015.

We suggest that policymakers should target injectable drugs, drugs with limited competition, and drugs experiencing shortages to further reduce the frequency of such spikes and prevent unnecessary spending by patients and payers associated with generic drug price spikes.
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Aayan N. Patel is a Student Researcher at PORTAL. 

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Aaron S. Kesselheim, MD, JD, MPH is Professor of Medicine at Harvard Medical School and Director of PORTAL.

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Benjamin N. Rome, MD is an Instructor of Medicine at Harvard Medical School ​and a faculty member at PORTAL. 


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