Treatment of Young Adults With Comorbid AUD/MDD: A Pilot Medication Trial

MDD and AUD are each highly prevalent among young adults, and the comorbidity of those two disorders occurs more often than would be expected by chance alone. The presence of this comorbidity is associated with increased risk for motor vehicle accidents, relapse to alcohol use, suicide, recurrence of depressive illness, increased morbidity, and costly hospitalization. Thus, the comorbidity of AUD/MDD is a highly significant public health problem among young adults, with considerable unmet treatment needs. Previous medication trials with SSRI antidepressants involving those co-occurring conditions, including our own recent trials with SSRI medications, have produced disappointing results, especially for decreasing the level of alcohol consumption. Mirtazapine is an FDA-approved medication for treating MDD with a unique pharmacological profile, unrelated to SSRIs. Recent study results suggest that mirtazapine is more effective than other antidepressants for treating non-comorbid depression. A few recent studies have demonstrated efficacy for mirtazapine for decreasing the depressive symptoms and the alcohol craving of subjects with comorbid AUD/MDD, but those studies did not measure level of alcohol consumption. Therefore, it is unclear whether mirtazapine decreases the level of alcohol use of that comorbid population. Our own recent pilot data suggest within-group efficacy for mirtazapine for decreasing both the excessive alcohol use and the depressive symptoms of persons with comorbid AD/MDD. However, that pilot study did not include a placebo control group, so the efficacy of mirtazapine for decreasing the level of alcohol use among persons with comorbid AUD/MDD remains unclear. To date, no double-blind, placebo-controlled study has even been conducted to assess whether mirtazapine decreases both the level of drinking and the depressive symptoms of young adults with comorbid AD/MDD. In this submission, we propose a proof of concept, double-blind, placebo-controlled pilot trial to provide a preliminary assessment of the efficacy of the medication mirtazapine vs. placebo in the treatment of young adults with co-occurring alcohol use disorders (AUD) and major depression (MDD). If results (effect sizes) from the proposed study are found to be promising concerning outcome differences between the mirtazapine and placebo groups, then we will use those findings to apply for an R01 study to definitively assess the efficacy of mirtazapine for treating young adults with AUD/MDD.