Evidence-Based Reviews

Antidepressants for pediatric patients

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Suicidality. The black-box warning regarding a risk of emergent suicidality when starting antidepressant treatment in children is controversial.44 The prospect that a medication intended to ameliorate depression might instead risk increasing suicidal thinking is alarming to parents and clinicians alike. To appropriately weigh and discuss the risks and benefits with families, it is important to understand the data upon which the warning is based.

Cates plot depicting the benefits of antidepressants vs risk of suicidal ideation for pediatric patients with anxiety disorders

In 2004, the FDA commissioned a review of 23 antidepressant trials, both published and unpublished, pooling studies across multiple indications (MDD, OCD, anxiety, and ADHD) and multiple antidepressant classes. This meta-analysis, which included nearly 4,400 pediatric patients, found a small but statistically significant increase in spontaneously-reported suicidal thoughts or actions, with a risk difference of 1% (95% confidence interval [CI], 1% to 2%).45 These data suggest that if one treats 100 pediatric patients, 1 to 2 of them may experience short-term increases in suicidal thinking or behavior.45 There were no differences in suicidal thinking when assessed systematically (ie, when all subjects reported symptoms of suicidal ideation on structured rating scales), and there were no completed suicides.45 A subsequent analysis that included 27 pediatric trials suggested an even lower, although still significant, risk difference (<1%), yielding a number needed to harm (NNH) of 143.46 Thus, with low NNT for efficacy (3 to 6) and relatively high NNH for emergent suicidal thoughts or behaviors (100 to 143), for many patients the benefits will outweigh the risks.

Cates plot depicting the benefits of antidepressants vs risk of suicidal ideation for pediatric patients with major depressive disorder

Figure 1, Figure 2, and Figure 3 are Cates plots that depict the absolute benefits of antidepressants compared with the risk of suicidality for pediatric patients with MDD, OCD, and anxiety disorders. Recent meta-analyses have suggested that the increased risk of suicidality in antidepressant trials is specific to studies that included children and adolescents, and is not observed in adult studies. A meta-analysis of 70 trials involving 18,526 participants suggested that the odds ratio of suicidality in trials of children and adolescents was 2.39 (95% CI, 1.31 to 4.33) compared with 0.81 (95% CI, 0.51 to 1.28) in adults.47 Additionally, a network meta-analysis exclusively focusing on pediatric antidepressant trials in MDD reported significantly higher suicidality-related adverse events in venlafaxine trials compared with placebo, duloxetine, and several SSRIs (fluoxetine, paroxetine, and escitalopram).20 These data should be interpreted with caution as differences in suicidality detected between agents is quite possibly related to differences in the method of assessment between trials, as opposed to actual differences in risk between agents.

Cates plot depicting the benefits of antidepressants vs risk of suicidal ideation for pediatric patients with obsessive-compulsive disorder

Epidemiologic data further support the use of antidepressants in pediatric patients, showing that antidepressant use is associated with decreased teen suicide attempts and completions,48 and the decline in prescriptions that occurred following the black-box warning was accompanied by a 14% increase in teen suicides.49 Multiple hypotheses have been proposed to explain the pediatric clinical trial findings. One idea is that potential adverse effects of activation, or the intended effects of restoring the motivation, energy, and social engagement that is often impaired in depression, increases the likelihood of thinking about suicide or acting on thoughts. Another theory is that reporting of suicidality may be increased, rather than increased de novo suicidality itself. Antidepressants are effective for treating pediatric anxiety disorders, including social anxiety disorder,16 which could result in more willingness to report. Also, the manner in which adverse effects are generally ascertained in trials might have led to increased spontaneous reporting. In many trials, investigators ask whether participants have any adverse effects in general, and inquire about specific adverse effects only if the family answers affirmatively. Thus, the increased rate of other adverse effects associated with antidepressants (sleep problems, gastrointestinal upset, dry mouth, etc.) might trigger a specific question regarding suicidal ideation, which the child or family then may be more likely to report. Alternatively, any type of psychiatric treatment could increase an individual’s propensity to report; in adolescent psychotherapy trials, non-medicated participants have reported emergent suicidality at similar frequencies as those described in drug trials.50 Regardless of the mechanism, the possibility of treatment-emergent suicidality is a low-frequency but serious event that necessitates careful monitoring when starting medication. Current guidelines suggest seeing children weekly for the first month after medication initiation, every 2 weeks for the following month, and monthly thereafter.51

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