The Potential Role of Pharmacogenomics in Optimizing Drug Regimens for Older People with Major Depressive Disorder

Major depressive disorder (MDD) is a mood disorder common in older individuals. While many clinical guidelines endorse the use of selective serotonin reuptake inhibitors (SSRIs) as first-line therapy in the treatment of MDD, the use of SSRIs in older populations can result in medication-related adverse events. The use of pharmacogenomic (PGx) testing as a personalized tool to determine optimal SSRI therapy could offer a means to decrease morbidity and improve overall quality of life in older people. This manuscript will review the epidemiology and criteria of MDD according to the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5), discuss the prevalence of MDD in older individuals, review the clinical treatment guidelines for the use of SSRIs in MDD, provide a brief overview of PGx testing, and present evidence for SSRI therapy modifications based on PGx testing.