Little sign of change
Among NDAs for chronic pain, the investigators found that eight (20.5%) included pooled safety reviews that reported systematic assessment of diversion. Seven (17.9%) reported systematic measurement of nonmedical use, and 15 (38.5%) assessed incident tolerance.
The study revealed that eight of nine products that were approved for acute pain were supported by at least one pivotal trial. The median duration of these 19 trials was 1 day, and they enrolled a median of 329 patients.
The investigators noted that the findings “underscore the evidence gaps that have limited clinicians’ and patients’ understanding and appreciation of the inherent risks of prescription opioid analgesics.”
Dr. Alexander, who has been an FDA advisory committee chairman and currently serves as a consultant to plaintiffs who are suing opioid manufacturers in federal multidistrict litigation, said the study “is a story about missed opportunities to improve the safety and to improve the regulatory review of these products.”
Coinvestigator Peter Lurie, MD, who was an official at the FDA from 2009 to 2017, said that “there’s not a lot of signs that things are changing” at the agency.
The study shows that the FDA has “accepted what the companies have been presenting,” said Dr. Lurie, who is president of the Center for Science in the Public Interest.
The FDA “absolutely has the authority” to require manufacturers to undertake more rigorous trials, but agency culture keeps it from making such demands, especially if doing so means a new applicant might have to conduct trials that weren’t previously required, Dr. Lurie said in an interview.
“FDA is pretty rigorous about trying to establish a level playing field. That’s a virtuous thing, but it becomes problematic when that prevents change,” said Dr. Lurie.
The most recent FDA guidance to manufacturers, issued in 2019, does not provide advice on criteria for endpoints, study duration, or which populations are most likely to benefit from opioid treatment. The agency also does not require drug manufacturers to formally collect data on safety, tolerance, overdose symptoms, or constipation.
The guidance does suggest that the agency would likely take into account public health considerations when evaluating opioids, such as the risk to the overall population for overdose and diversion.
‘Overwhelming evidence’
Dr. Kolodny said that, as far as he is aware, “this is the first scientific publication in a peer-reviewed journal demonstrating clearly the problems with FDA’s opioid approval process.”
The article offers “overwhelming evidence that they are improperly approving the most dangerous medications – medications that killed more people than any other medication on the market,” added Dr. Kolodny, who is also president of Physicians for Responsible Opioid Prescribing.
Asked to respond to the study findings, FDA spokesperson Charles Kohler said the agency “does not comment on specific studies but evaluates them as part of the body of evidence to further our understanding about a particular issue and assist in our mission to protect public health.”
A version of this article originally appeared on Medscape.com.