How FDA Failures Contributed to the Opioid Crisis

Introduction

In the United States, opioid use disorder (OUD) and opioid overdose were once rare. But over the past 25 years, the number of Americans suffering from OUD increased exponentially and in parallel with an unprecedented increase in opioid prescribing.¹ Today, OUD is common, especially in patients with chronic pain treated with opioid analgesics,¹ and opioid overdose is the leading cause of accidental death.²

The high prevalence of OUD has led to an array of health and social problems. The United States has seen record high rates of neonatal opioid withdrawal syndrome, more children entering foster care,³ rising heroin and fentanyl use,⁴ outbreaks of injection-related infectious diseases,⁵ and a decline in workforce participation in areas with relatively high rates of opioid prescribing.⁶ The Centers for Disease Control and Prevention (CDC) has aptly described the crisis as the “worst drug overdose epidemic in [US] history.”¹

Using the term epidemic to describe the sharp increase in OUD and overdose deaths is appropriate. But we should recognize that, unlike communicable disease outbreaks, the opioid crisis was not caused by a pathogen. As a federal judge presiding over hundreds of county and state cases against opioid manufacturers and distributors recently found: “It is accurate to describe the opioid epidemic as a man-made plague, 20 years in the making.”⁷

Much of the responsibility for the opioid crisis rests with the pharmaceutical industry’s promotion of aggressive opioid prescribing. Indeed, in a first-of-its-kind trial against opioid manufacturers, a state court in Oklahoma last year found that the “exponentially increasing rates of addiction,” “overdose deaths,” and babies born exposed to opioids were caused by “false, misleading, and dangerous marketing campaigns” for opioid medications.⁸ But the fact that opioid manufacturers disseminated false claims regarding the risks and benefits of opioids for the past 25 years points to a dereliction of duty by the US Food and Drug Administration (FDA)—the federal agency charged with regulating pharmaceutical companies.

Regulatory Failures

The FDA’s regulatory failures with respect to opioids have not gone unnoticed. In 2017, the President’s Commission on Combatting Drug Addiction and the Opioid Crisis found that the opioid crisis was caused in part by “inadequate oversight by the Food and Drug Administration,” and the National Academy of Sciences (NAS) publicly called on the FDA to overhaul its opioid policies.^9,10 Last year, a former FDA Commissioner rebuked the agency he had previously led, saying on the television program 60 Minutes that the FDA was wrong to allow promotion of opioid use for chronic pain.¹¹

Despite this mounting criticism, FDA policies for approving and labeling opioids remain largely unchanged. The FDA has not undertaken a root cause analysis of its regulatory errors that contributed to this public health catastrophe, let alone instituted any major reforms.¹¹ To the contrary, the agency has adopted a defensive posture and sought to shift blame. For example, in response to a critical letter from Senator Maggie Hassan of New Hampshire, the FDA’s top official at the Center for Drug Evaluation and Research since 1994 offered a blanket defense of the FDA’s handling of opioids, claiming that the agency has properly enforced the Food, Drug, and Cosmetic Act.¹²

This article does not attempt to provide a full accounting of the FDA’s role in the opioid crisis. Nor is such an accounting possible without full participation of the FDA and its official oversight bodies. Rather, this article focuses on just a few policy failures that contributed to the opioid crisis. Until these past mistakes are understood and corrected, the United States will remain vulnerable to health crises caused by inadequate regulation of pharmaceutical companies. In the following discussion, I detail FDA failures to regulate false marketing claims by opioid manufacturers and to require adequate and well-controlled clinical trials for opioids and its poor management of conflicts of interest between FDA staff and industry. Understanding how and why the FDA allowed improper marketing of opioids can help us better address the current crisis and improve regulation of pharmaceutical companies in the future.

Failure to Properly Enforce Marketing Regulations

The Food, Drug, and Cosmetic Act requires drug manufacturers to demonstrate that their products are both safe and effective before they are marketed.¹³ The benefits of a drug must outweigh potential risks for specific indications listed on an FDA-approved label.¹³ Although prescribing medication for unapproved uses is common and sometimes appropriate, drug makers are prohibited from promoting off-label uses without premarket review by the FDA.¹³

The FDA did not properly enforce the Food, Drug, and Cosmetic Act when it approved Purdue Pharma’s new drug application for extended-release (ER) oxycodone in 1995. Had it done so, ER oxycodone’s label would have had a narrow indication for the specific conditions for which the benefits of ER oxycodone outweigh the risks, such as relief from severe pain from a life-limiting illness. Instead, the label on ER oxycodone featured a broad indication,¹⁴ allowing Purdue to promote the drug’s use for common conditions for which opioids are more likely to harm than help, such as low-back pain and fibromyalgia.

The FDA has not undertaken a root cause analysis of its regulatory errors that contributed to this public health catastrophe. 

As Purdue earned billions of dollars from sales of oxycodone, other drug companies took note.¹⁵ They introduced their own opioids and joined Purdue in funding a brilliant, multifaceted campaign that changed the culture of opioid prescribing in the United States. Clinicians who previously understood that opioids are addictive, that development of tolerance results in dose escalation, and that dependence would make discontinuation difficult began hearing from spokesmen for opioid manufacturers that addiction was rare and that long-term use was safe and effective.1^{,6,7,8,9,10,11,12,13,15} Risks were minimized, benefits were exaggerated, and opioid prescribing surged.

In 2002, faced with evidence that opioid prescribing had risen beyond levels that could be clinically warranted, the FDA convened an advisory committee meeting of 10 outside experts and asked if the broad indication on opioid labels should be narrowed to prohibit marketing for  common chronic pain conditions.¹⁶ Eight of these experts had financial ties to pharmaceutical companies, including Purdue,¹⁶ and advised the FDA against narrowing the indication.¹⁷ An opportunity to reign in overprescribing early in the crisis was lost, and, by 2013, enough opioids were prescribed to provide every adult in the country with a full pill bottle.¹⁸

Failure to Obtain Evidence of Long-term Safety and Effectiveness

Marketing opioids as safe for long-term use is at odds with a growing body of medical literature, dating from the 1950s,¹⁹ which demonstrates serious dose-dependent risks, including addiction, respiratory depression, neuroendocrine dysfunction, and other medical problems.²⁰ Even in safety trials for opioid drugs approved by the FDA, serious adverse events—including respiratory depression, death, and drug diversion—are common.^21,22 And, despite evidence that as many as 41% of patients on long-term opioids meet the Diagnostic and Statistical Manual of Mental Disorders fifth edition(DSM-5) criteria for OUD,²³ drug companies are not required to assess clinical trial subjects for development of OUD at the conclusion of a study.

The Food, Drug, and Cosmetic Act requires “adequate and well-controlled studies” before products can be approved and promoted as safe and effective.¹³ The FDA generally requires at least 2 randomized controlled trials demonstrating clear efficacy for a proposed indication.²⁴ Yet it approved extended release oxycodone based on only one adequate and well-controlled study, a 2-week clinical trial in osteoarthritis patients.²⁵

FDA failure to obtain adequate evidence of effectiveness was not limited to oxycodone. Over the past 25 years, despite mounting evidence that a surge in opioid consumption was resulting in adverse public health consequences, the FDA continued to approve new opioid formulations for chronic pain based on efficacy trials utilizing a controversial methodology called enriched enrollment randomized withdrawal (EERW).²⁶ Since its 2006 approval of oxymorphone, the FDA has relied on EERW as evidence of opioid efficacy for chronic pain.²⁷ EERW trials differ from traditional double-blind, randomized, controlled studies. In an EERW trial, prior to randomization for a double-blind phase, all subjects are made physiologically dependent on the opioid in a 4- to 6-week open-label phase. Then only the patients who tolerated the opioid and found it helpful during the open-label phase are randomized to remain on the opioid or switch to a placebo.

Critics of EERW have correctly described this methodology as “cooking the books” for 2 reasons.²⁸ First, because only patients who tolerated the opioid and found it helpful are allowed to proceed to randomization, the study is not representative of the general population, and the results cannot be generalized to clinical practice. Second, because daily use of opioids causes physiological dependence, efficacy results are skewed in favor of the subjects who remain on the opioid. This is because opioid-dependent subjects who are switched to placebo experience opioid withdrawal symptoms, including increased sensitivity to pain. Moreover, switching opioid-dependent subjects to placebo renders the study not truly double-blind.

The FDA’s decision to rely on EERW trial methodology is a consequence of the agency’s close ties to industry. In fact, the FDA’s decision to use EERW for analgesics was based on discussions at private meetings between FDA officials and pharmaceutical company executives hosted by an organization called Initiative on Methods, Measurement, and Pain Assessment in Clinical Trials (IMMPACT).²⁹ Drug companies paid up to $35 000 each for the opportunity to attend IMMPACT meetings and interact with FDA staff.²⁹ Yet, despite the uproar that followed public disclosure of the IMMPACT meetings, the FDA continues to rely on EERW trials as evidence that opioids are effective for chronic pain.²⁶

Failure to Manage Conflicts of Interest

The FDA has never been held to account for its improper handling of the opioid crisis. But the FDA’s conduct is all the more troubling in light of the close relationship between the agency officials responsible for opioid oversight and opioid manufacturers. For example, the 2 principal FDA reviewers who originally approved Purdue’s oxycodone application both took positions at Purdue after leaving the agency.¹¹ Over the past 20 years, several other FDA staff involved in opioid approvals also left the FDA to work for opioid makers. Last January, the head of the FDA’s analgesic division retired from the FDA to start her own consulting business, which promises drug makers “help” to “successfully and efficiently bring your products to market” with “more than 30 years of experience at the FDA.”³⁰ To be clear, the revolving door between the FDA and the pharmaceutical industry is not limited to opioids. A 2018 study found that 11 of 16 FDA medical reviewers involved in approving 28 products now work for the companies whose products they regulated.³¹ Without appropriate limits on employment after leaving the FDA, staff might be tempted to put the interests of future employers, whose favor they wish to gain, ahead of public health.

Oversight Recommendations

While fewer clinicians are initiating long-term opioids, overprescribing is still a problem. According to a recently published report, more than 2.9 million people initiated opioid use in December 2017.³² The FDA’s continued approval of new opioids exacerbates this problem. Each time a branded opioid hits the market, the company, eager for return on its investment, is given an incentive and, in essence, a license to promote aggressive prescribing. The FDA’s continued approval of new opioids pits the financial interests of drug companies against city, state, and federal efforts to discourage initiation of long-term opioids.

To finally end the opioid crisis, the FDA must enforce the Food, Drug, and Cosmetic Act, and it must act on recommendations from the NAS for an overhaul of its opioid approval and removal policies. The broad indication on opioid labels must be narrowed, and an explicit warning against long-term use and high-dose prescribing should be added. The label should reinforce, rather than contradict, guidance from the CDC, the Department of Veterans Affairs, the Agency for Healthcare Research and Quality, and other public health agencies that are calling for more cautious prescribing.^18,33,34

Oversight bodies within the Executive Branch and Congress should conduct a long-overdue examination of the FDA’s role in the opioid crisis. Past mistakes must be corrected, and preventative measures, such as rules to stop the revolving door, must be put in place to ensure that public health is consistently prioritized ahead of industry interests. Understanding why our regulatory systems failed to prevent a man-made epidemic is a critical step toward abating the opioid crisis and preventing future public health catastrophes.