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In pediatric patients, the selective serotonin reuptake inhibitors (SSRIs) escitalopram and citalopram (es/citalopram) are commonly prescribed for anxiety and depressive disorders. However, pharmacogenetic studies examining CYP2C19 metabolizer status and es/citalopram treatment outcomes have largely focused on adults. We report a retrospective study of electronic medical record data from 263 youth < 19 years of age with anxiety and/or depressive disorders prescribed escitalopram or citalopram who underwent routine clinical  CYP2C19  genotyping. Slower CYP2C19 metabolizers experienced more untoward effects than faster metabolizers ( p =  0.015), including activation symptoms ( p  = 0.029) and had more rapid weight gain ( p  = 0.018). A larger proportion of slower metabolizers discontinued treatment with es/citalopram than normal metabolizers ( p  = 0.007). Meanwhile, faster metabolizers responded more quickly to es/citalopram ( p  = 0.005) and trended toward less time spent in subsequent hospitalizations ( p  = 0.06). These results highlight a disparity in treatment outcomes with es/citalopram treatment in youth with anxiety and/or depressive disorders when standardized dosing strategies were used without consideration of CYP2C19 metabolizer status. Larger, prospective trials are warranted to assess whether tailored dosing of es/citalopram based on CYP2C19 metabolizer status improves treatment outcomes in this patient population.

Influence of CYP2C19 Metabolizer Status on Escitalopram/Citalopram Tolerability and Response in Youth With Anxiety and Depressive Disorders