Should the FDA Reconsider Antidepressant Black Box Warnings?

For almost two decades, antidepressants have carried black box warnings linking the medications to an increased risk for suicidal thoughts and behaviors in young people. Paradoxically, and for almost as long, evidence suggests these warnings may have led to fewer depression diagnoses, reduced prescriptions, and, ultimately, higher suicide rates.

With mounting evidence of these negative unintended consequences, some clinicians and researchers are urging the US Food and Drug Administration (FDA) to consider revising — or even eliminating — black box warnings on these medications.

The latest report challenging the utility of the 2005 warnings was particularly sobering. Published in October in Health Affairs, the systematic review of studies from 2003 to 2022 showed a 20%-40% decline in physician visits for depression, a 20%-50% decline in antidepressant use, and an abrupt increase in psychotropic drug poisonings and suicides — all after the warnings were added.

“FDA officials should review the totality of evidence and err on the side of caution in acknowledging possible harms of the antidepressant warnings,” lead author Stephen Soumerai, ScD, professor of population medicine at Harvard Medical School at Harvard Pilgrim Health Care Institute, Boston, and colleagues wrote. They called on the FDA to replace the boxed warnings with a routine warning in labeling.

While good prospective data on the risks and benefits of antidepressants in youth were limited when the boxed warnings were instituted, there is more information now, said Jeffrey Strawn, MD, professor of psychiatry and pediatrics at the University of Cincinnati College of Medicine, Cincinnati. Strawn, whose research on the topic has been cited frequently over the years, said the new evidence suggests it is time for the FDA to reevaluate the warnings.

“I don’t think that they’ve been useful. They’ve actually been harmful,” Strawn told Medscape Medical News. “These boxed warnings have decreased physicians’ and other clinicians’ comfort and tendency to prescribe.”

Decline in Diagnoses

The FDA issued its first warning about the potential for suicidal thoughts and behavior in children in 2003. After an advisory panel weighed the evidence, the agency added a boxed warning in 2005 to all antidepressants for children younger than 18 years. The warning was expanded in 2007 to include young adults through age 24.

Data suggesting that the warnings have had unintended effects can be found going back to just after they were issued. For instance, in 2009, Medscape Medical News reported that after rising for years, the rate of new pediatric depression diagnoses fell precipitously after the warning was added, with primary care physicians diagnosing 44% fewer cases.

In 2014, citing evidence of fewer diagnoses and rising psychotropic drug poisonings, Weill Cornell Medicine Professor Richard A. Friedman, MD, called on the FDA in an NEJM perspective to remove the boxed warnings.

Strawn and colleagues reported in an often-cited 2014 systematic review and meta-analysis that in nine trials involving 1673 patients and six medications, antidepressants were superior to placebo, with no increased risk for suicidal thoughts or behavior.

He has also studied adverse effects of the medications, reporting in Pharmacotherapy that suicidality risk might be more likely with some medications, such as paroxetine and venlafaxine, and that it could be influenced by baseline suicidality, among many other factors. A Swedish register study found that risk was highest the month before starting a medication, Strawn and colleagues wrote.

Dara Sakolsky, MD, PhD, associate professor of psychiatry and associate medical director, Services for Teens at Risk at the University of Pittsburgh School of Medicine, Pittsburgh, told MedscapeMedical News that because of “these negative unintended consequences,” the FDA should lower the temperature by putting the warnings in labeling.

“It makes sense based on the data that we have at hand now,” said Sakolsky.

The Dangers of Untreated Depression

Even with this new information, lingering concerns about earlier studies that pointed to increased suicidality risk may discourage prescribing by primary care physicians and pediatricians, and that worries researchers and psychiatrists.

“My concern is that the risk for suicide and suicidal behavior may be higher in untreated depression than the risk of suicidal thoughts or behaviors from antidepressants,” Jeffrey Bridge, PhD, director of the Center for Suicide Prevention and Research at Nationwide Children’s Hospital, Columbus, Ohio, told Medscape Medical News.

Bridge is the lead author of a much-cited 2007 meta-analysis in JAMA that showed that the benefits of antidepressants in children and adolescents appeared to be greater than the risks for suicidality. “The concern about antidepressants must be considered in the context of possible benefit,” wrote Bridge, who also is professor of pediatrics, psychiatry, and behavioral health at Ohio State University College of Medicine, Columbus, Ohio.

Depression and suicide are a scourge for those younger than 25 years. A 2021 literature review noted that the prevalence of depression — which has been increasing for all Americans — has risen more among adolescents than adults. Depression is “strongly associated with suicide,” the authors wrote.

In 2021, the National Institute of Mental Health reported suicide was the second leading cause of death among 10- to 14-year-olds and the third leading cause of death among those aged 15-24 years.

Suicide kills more kids aged between 10 and 24 years than cancer and all other illnesses combined, John Campo, MD, director of child and adolescent psychiatry at Johns Hopkins University School of Medicine and vice president of psychiatric services at Kennedy Krieger Institute, told Medscape Medical News.

Meanwhile, he added, the medications work and clinicians balance risk and benefit in prescribing.

The landmark 2007 Treatment for Adolescents with Depression Study showed that fluoxetine, especially in combination with cognitive-behavioral therapy (CBT), was significantly better than placebo. Since that time, legions of trials have shown the drugs’ effectiveness.

The most effective treatment for teen depression is a combination of CBT and a selective serotonin reuptake inhibitor, said Sakolsky.

“We know that the evidence for that is pretty good,” she said. “On the flip side, we know the risk of having an adverse outcome is pretty low.”

Sakolsky tells patients and families that perhaps 1 in 146 will have a suicidal thought or behavior. “That’s pretty rare when we know how effective these medicines are,” she noted.

Strawn said he always notes that no suicides took place in the trials that led to the warning and stresses that he closely monitors patients. “While the more recent prospective data are reassuring,” the suicidality risk “is something that we still talk about,” he said. He also discusses how some antidepressants seem to increase risk more than others.

For Campo, the discussion is based on his reading of the evidence, not the presence of the FDA warning.

“Based on what we know, I still think it’s fair to proceed with the idea that there is a small, but real risk,” he said. However, “at the same time, the medications might be exceptionally helpful for some kids.”

‘What Do We Do Now?’

When the FDA issued its warning in 2005, the agency said it identified the risk for suicidality in a combined analysis of short-term placebo-controlled trials of nine antidepressants. It ultimately included 24 trials involving more than 4400 patients. The risk was highest in the first few months. The average risk for those taking antidepressants was 4%, twice the placebo risk of 2%. There were no suicides in these trials, however.

The trials relied on spontaneous reports of adverse events, not predetermined measures, Campo said. Even so, that 2% difference is “nothing to sneeze at,” he noted.

Bridge’s meta-analysis showed a smaller difference — closer to 0.7%. “But it was still statistically significant,” Campo said. “I have trouble ignoring that.”

The unintended consequences of the warning can’t be studied in a randomized controlled trial. Studies have shown an association but not a direct cause-and-effect relationship between the warning and a decline in treatment and rise in suicides.

But the potential for suicidal thoughts and behavior with antidepressants has been studied prospectively. Some older studies found a significant risk, while more recent trials have not.

While the Health Affairs analysis “certainly makes a strong case,” it is observational data, Campo said.

“The question is, what do we do now in retrospect? Do you say, ‘Never mind. We don’t need the black box warning anymore?’” he said. “That would require a pretty careful look.”

The Health Affairs paper “makes me think that there are other areas of research that that need to be completed and done and updated, and then there should be an assessment, a reevaluation from the FDA,” said Bridge. A new meta-analysis “would be very informative,” he said.

What’s Next?

When asked about the Health Affairs paper and whether the agency would review the warnings, an FDA spokesperson told MedscapeMedical News that 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.”

Sakolsky said the data clearly point to the damage that the warning has done over the past two decades, but that things might be improving. Studies conducted more recently might not have captured some changes in practice, she said.

For instance, she noted, in 2022, the US Preventive Services Task Force recommended screening for major depressive disorder in adolescents aged 12-18 years. In turn, she has seen more patients in her office who were referred by pediatricians who had conducted the screening, said Sakolsky.

Strawn said the time for pontificating is long past due. “We’re withholding medications and other treatments that could potentially be effective for disorders that, in and of themselves, are associated with a significant increase in the risk of suicide,” he said.

After the FDA instituted the warning, “we were all very nervous,” about the potential fallout, said Campo. He said a part of him wishes that the warnings had been “more mundane and less dramatic.”

Despite the unintended consequences, “it’s going to be hard to put the genie back in the bottle,” he said.

Campo and Sakolsky reported no relevant financial relationships. Strawn disclosed that his institution has received research funding from the National Institute of Child Health and Human Development, the Patient-Centered Outcomes Research Institute (PCORI), and AbbVie. Bridge reported that he received grant support from the National Institute of Mental Health, Centers for Disease Control and Prevention, and PCORI; is a scientific advisor to Clarigent Health; and is on the Scientific Council of the American Foundation for Suicide Prevention.

Alicia Ault is a Saint Petersburg, Florida-based freelance journalist whose work has appeared in many health and science publications, including Smithsonian.com. You can find her on X: @aliciaault and on Bluesky: @aliciaault.bsky.social.