“…Mixed depression is also associated with younger age at onset, more family history of BD, and poorer response to treatments [ 23 , 24 , 25 , 26 , 27 , 28 ]. Mixed depression is characterized by more severe depressive symptoms, worse outcome, lower family quality of life, poorer global functioning, more externalizing problems, increased presence of comorbidities, and greater suicide risk than non-mixed depression [ 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 ]. Such greater illness burden might be driven by its excitatory compounds [ 32 ], which may be subsided by a more dysregulated neurobiological substrate [ 21 ].…”